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  <body>
    <h1 class="title">CUPS Programming Manual</h1>
    <p>Michael R Sweet</p>
    <p>Copyright &#xa9; 2007-2020 by Apple Inc. All Rights Reserved.</p>
    <div class="contents">
      <h2 class="title">Contents</h2>
      <ul class="contents">
        <li><a href="#introduction">Introduction</a><ul class="subcontents">
          <li><a href="#guidelines">Guidelines</a></li>
          <li><a href="#terms-used-in-this-document">Terms Used in This Document</a></li>
          <li><a href="#compiling-programs-that-use-the-cups-api">Compiling Programs That Use the CUPS API</a></li>
        </ul></li>
        <li><a href="#working-with-destinations">Working with Destinations</a><ul class="subcontents">
          <li><a href="#finding-available-destinations">Finding Available Destinations</a></li>
          <li><a href="#basic-destination-information">Basic Destination Information</a></li>
          <li><a href="#detailed-destination-information">Detailed Destination Information</a></li>
          <li><a href="#submitting-a-print-job">Submitting a Print Job</a></li>
        </ul></li>
        <li><a href="#sending-ipp-requests">Sending IPP Requests</a><ul class="subcontents">
          <li><a href="#connecting-to-the-scheduler-or-printer">Connecting to the Scheduler or Printer</a></li>
          <li><a href="#creating-an-ipp-request">Creating an IPP Request</a></li>
          <li><a href="#sending-the-ipp-request">Sending the IPP Request</a></li>
          <li><a href="#processing-the-ipp-response">Processing the IPP Response</a></li>
          <li><a href="#authentication">Authentication</a></li>
        </ul></li>
        <li><a href="#FUNCTIONS">Functions</a><ul class="subcontents">
          <li><a href="#cupsAddDest">cupsAddDest</a></li>
          <li><a href="#cupsAddDestMediaOptions">cupsAddDestMediaOptions</a></li>
          <li><a href="#cupsAddIntegerOption">cupsAddIntegerOption</a></li>
          <li><a href="#cupsAddOption">cupsAddOption</a></li>
          <li><a href="#cupsCancelDestJob">cupsCancelDestJob</a></li>
          <li><a href="#cupsCheckDestSupported">cupsCheckDestSupported</a></li>
          <li><a href="#cupsCloseDestJob">cupsCloseDestJob</a></li>
          <li><a href="#cupsConnectDest">cupsConnectDest</a></li>
          <li><a href="#cupsCopyDest">cupsCopyDest</a></li>
          <li><a href="#cupsCopyDestConflicts">cupsCopyDestConflicts</a></li>
          <li><a href="#cupsCopyDestInfo">cupsCopyDestInfo</a></li>
          <li><a href="#cupsCreateDestJob">cupsCreateDestJob</a></li>
          <li><a href="#cupsDoAuthentication">cupsDoAuthentication</a></li>
          <li><a href="#cupsEncodeOption">cupsEncodeOption</a></li>
          <li><a href="#cupsEncodeOptions">cupsEncodeOptions</a></li>
          <li><a href="#cupsEncodeOptions2">cupsEncodeOptions2</a></li>
          <li><a href="#cupsEncryption">cupsEncryption</a></li>
          <li><a href="#cupsEnumDests">cupsEnumDests</a></li>
          <li><a href="#cupsFindDestDefault">cupsFindDestDefault</a></li>
          <li><a href="#cupsFindDestReady">cupsFindDestReady</a></li>
          <li><a href="#cupsFindDestSupported">cupsFindDestSupported</a></li>
          <li><a href="#cupsFinishDestDocument">cupsFinishDestDocument</a></li>
          <li><a href="#cupsFreeDestInfo">cupsFreeDestInfo</a></li>
          <li><a href="#cupsFreeDests">cupsFreeDests</a></li>
          <li><a href="#cupsFreeJobs">cupsFreeJobs</a></li>
          <li><a href="#cupsFreeOptions">cupsFreeOptions</a></li>
          <li><a href="#cupsGetDest">cupsGetDest</a></li>
          <li><a href="#cupsGetDestMediaByIndex">cupsGetDestMediaByIndex</a></li>
          <li><a href="#cupsGetDestMediaByName">cupsGetDestMediaByName</a></li>
          <li><a href="#cupsGetDestMediaBySize">cupsGetDestMediaBySize</a></li>
          <li><a href="#cupsGetDestMediaCount">cupsGetDestMediaCount</a></li>
          <li><a href="#cupsGetDestMediaDefault">cupsGetDestMediaDefault</a></li>
          <li><a href="#cupsGetDestWithURI">cupsGetDestWithURI</a></li>
          <li><a href="#cupsGetDests2">cupsGetDests2</a></li>
          <li><a href="#cupsGetIntegerOption">cupsGetIntegerOption</a></li>
          <li><a href="#cupsGetJobs2">cupsGetJobs2</a></li>
          <li><a href="#cupsGetNamedDest">cupsGetNamedDest</a></li>
          <li><a href="#cupsGetOption">cupsGetOption</a></li>
          <li><a href="#cupsGetPassword2">cupsGetPassword2</a></li>
          <li><a href="#cupsLocalizeDestMedia">cupsLocalizeDestMedia</a></li>
          <li><a href="#cupsLocalizeDestOption">cupsLocalizeDestOption</a></li>
          <li><a href="#cupsLocalizeDestValue">cupsLocalizeDestValue</a></li>
          <li><a href="#cupsMakeServerCredentials">cupsMakeServerCredentials</a></li>
          <li><a href="#cupsParseOptions">cupsParseOptions</a></li>
          <li><a href="#cupsRemoveDest">cupsRemoveDest</a></li>
          <li><a href="#cupsRemoveOption">cupsRemoveOption</a></li>
          <li><a href="#cupsServer">cupsServer</a></li>
          <li><a href="#cupsSetClientCertCB">cupsSetClientCertCB</a></li>
          <li><a href="#cupsSetCredentials">cupsSetCredentials</a></li>
          <li><a href="#cupsSetDefaultDest">cupsSetDefaultDest</a></li>
          <li><a href="#cupsSetDests2">cupsSetDests2</a></li>
          <li><a href="#cupsSetEncryption">cupsSetEncryption</a></li>
          <li><a href="#cupsSetPasswordCB2">cupsSetPasswordCB2</a></li>
          <li><a href="#cupsSetServer">cupsSetServer</a></li>
          <li><a href="#cupsSetServerCertCB">cupsSetServerCertCB</a></li>
          <li><a href="#cupsSetServerCredentials">cupsSetServerCredentials</a></li>
          <li><a href="#cupsSetUser">cupsSetUser</a></li>
          <li><a href="#cupsSetUserAgent">cupsSetUserAgent</a></li>
          <li><a href="#cupsStartDestDocument">cupsStartDestDocument</a></li>
          <li><a href="#cupsUser">cupsUser</a></li>
          <li><a href="#cupsUserAgent">cupsUserAgent</a></li>
          <li><a href="#httpAcceptConnection">httpAcceptConnection</a></li>
          <li><a href="#httpAddCredential">httpAddCredential</a></li>
          <li><a href="#httpAddrAny">httpAddrAny</a></li>
          <li><a href="#httpAddrClose">httpAddrClose</a></li>
          <li><a href="#httpAddrConnect2">httpAddrConnect2</a></li>
          <li><a href="#httpAddrCopyList">httpAddrCopyList</a></li>
          <li><a href="#httpAddrEqual">httpAddrEqual</a></li>
          <li><a href="#httpAddrFamily">httpAddrFamily</a></li>
          <li><a href="#httpAddrFreeList">httpAddrFreeList</a></li>
          <li><a href="#httpAddrGetList">httpAddrGetList</a></li>
          <li><a href="#httpAddrLength">httpAddrLength</a></li>
          <li><a href="#httpAddrListen">httpAddrListen</a></li>
          <li><a href="#httpAddrLocalhost">httpAddrLocalhost</a></li>
          <li><a href="#httpAddrLookup">httpAddrLookup</a></li>
          <li><a href="#httpAddrPort">httpAddrPort</a></li>
          <li><a href="#httpAddrString">httpAddrString</a></li>
          <li><a href="#httpAssembleURI">httpAssembleURI</a></li>
          <li><a href="#httpAssembleURIf">httpAssembleURIf</a></li>
          <li><a href="#httpAssembleUUID">httpAssembleUUID</a></li>
          <li><a href="#httpBlocking">httpBlocking</a></li>
          <li><a href="#httpCheck">httpCheck</a></li>
          <li><a href="#httpClearCookie">httpClearCookie</a></li>
          <li><a href="#httpClearFields">httpClearFields</a></li>
          <li><a href="#httpClose">httpClose</a></li>
          <li><a href="#httpCompareCredentials">httpCompareCredentials</a></li>
          <li><a href="#httpConnect2">httpConnect2</a></li>
          <li><a href="#httpCopyCredentials">httpCopyCredentials</a></li>
          <li><a href="#httpCredentialsAreValidForName">httpCredentialsAreValidForName</a></li>
          <li><a href="#httpCredentialsGetExpiration">httpCredentialsGetExpiration</a></li>
          <li><a href="#httpCredentialsGetTrust">httpCredentialsGetTrust</a></li>
          <li><a href="#httpCredentialsString">httpCredentialsString</a></li>
          <li><a href="#httpDecode64_2">httpDecode64_2</a></li>
          <li><a href="#httpDelete">httpDelete</a></li>
          <li><a href="#httpEncode64_2">httpEncode64_2</a></li>
          <li><a href="#httpEncryption">httpEncryption</a></li>
          <li><a href="#httpError">httpError</a></li>
          <li><a href="#httpFieldValue">httpFieldValue</a></li>
          <li><a href="#httpFlush">httpFlush</a></li>
          <li><a href="#httpFlushWrite">httpFlushWrite</a></li>
          <li><a href="#httpFreeCredentials">httpFreeCredentials</a></li>
          <li><a href="#httpGet">httpGet</a></li>
          <li><a href="#httpGetActivity">httpGetActivity</a></li>
          <li><a href="#httpGetAddress">httpGetAddress</a></li>
          <li><a href="#httpGetAuthString">httpGetAuthString</a></li>
          <li><a href="#httpGetBlocking">httpGetBlocking</a></li>
          <li><a href="#httpGetContentEncoding">httpGetContentEncoding</a></li>
          <li><a href="#httpGetCookie">httpGetCookie</a></li>
          <li><a href="#httpGetDateString2">httpGetDateString2</a></li>
          <li><a href="#httpGetDateTime">httpGetDateTime</a></li>
          <li><a href="#httpGetEncryption">httpGetEncryption</a></li>
          <li><a href="#httpGetExpect">httpGetExpect</a></li>
          <li><a href="#httpGetFd">httpGetFd</a></li>
          <li><a href="#httpGetField">httpGetField</a></li>
          <li><a href="#httpGetHostname">httpGetHostname</a></li>
          <li><a href="#httpGetKeepAlive">httpGetKeepAlive</a></li>
          <li><a href="#httpGetLength2">httpGetLength2</a></li>
          <li><a href="#httpGetPending">httpGetPending</a></li>
          <li><a href="#httpGetReady">httpGetReady</a></li>
          <li><a href="#httpGetRemaining">httpGetRemaining</a></li>
          <li><a href="#httpGetState">httpGetState</a></li>
          <li><a href="#httpGetStatus">httpGetStatus</a></li>
          <li><a href="#httpGetSubField2">httpGetSubField2</a></li>
          <li><a href="#httpGetVersion">httpGetVersion</a></li>
          <li><a href="#httpGets">httpGets</a></li>
          <li><a href="#httpHead">httpHead</a></li>
          <li><a href="#httpInitialize">httpInitialize</a></li>
          <li><a href="#httpIsChunked">httpIsChunked</a></li>
          <li><a href="#httpIsEncrypted">httpIsEncrypted</a></li>
          <li><a href="#httpLoadCredentials">httpLoadCredentials</a></li>
          <li><a href="#httpOptions">httpOptions</a></li>
          <li><a href="#httpPeek">httpPeek</a></li>
          <li><a href="#httpPost">httpPost</a></li>
          <li><a href="#httpPut">httpPut</a></li>
          <li><a href="#httpRead2">httpRead2</a></li>
          <li><a href="#httpReadRequest">httpReadRequest</a></li>
          <li><a href="#httpReconnect2">httpReconnect2</a></li>
          <li><a href="#httpResolveHostname">httpResolveHostname</a></li>
          <li><a href="#httpSaveCredentials">httpSaveCredentials</a></li>
          <li><a href="#httpSeparateURI">httpSeparateURI</a></li>
          <li><a href="#httpSetAuthString">httpSetAuthString</a></li>
          <li><a href="#httpSetCookie">httpSetCookie</a></li>
          <li><a href="#httpSetCredentials">httpSetCredentials</a></li>
          <li><a href="#httpSetDefaultField">httpSetDefaultField</a></li>
          <li><a href="#httpSetExpect">httpSetExpect</a></li>
          <li><a href="#httpSetField">httpSetField</a></li>
          <li><a href="#httpSetKeepAlive">httpSetKeepAlive</a></li>
          <li><a href="#httpSetLength">httpSetLength</a></li>
          <li><a href="#httpSetTimeout">httpSetTimeout</a></li>
          <li><a href="#httpShutdown">httpShutdown</a></li>
          <li><a href="#httpStateString">httpStateString</a></li>
          <li><a href="#httpStatus">httpStatus</a></li>
          <li><a href="#httpURIStatusString">httpURIStatusString</a></li>
          <li><a href="#httpUpdate">httpUpdate</a></li>
          <li><a href="#httpWait">httpWait</a></li>
          <li><a href="#httpWrite2">httpWrite2</a></li>
          <li><a href="#httpWriteResponse">httpWriteResponse</a></li>
          <li><a href="#ippAddBoolean">ippAddBoolean</a></li>
          <li><a href="#ippAddBooleans">ippAddBooleans</a></li>
          <li><a href="#ippAddCollection">ippAddCollection</a></li>
          <li><a href="#ippAddCollections">ippAddCollections</a></li>
          <li><a href="#ippAddDate">ippAddDate</a></li>
          <li><a href="#ippAddInteger">ippAddInteger</a></li>
          <li><a href="#ippAddIntegers">ippAddIntegers</a></li>
          <li><a href="#ippAddOctetString">ippAddOctetString</a></li>
          <li><a href="#ippAddOutOfBand">ippAddOutOfBand</a></li>
          <li><a href="#ippAddRange">ippAddRange</a></li>
          <li><a href="#ippAddRanges">ippAddRanges</a></li>
          <li><a href="#ippAddResolution">ippAddResolution</a></li>
          <li><a href="#ippAddResolutions">ippAddResolutions</a></li>
          <li><a href="#ippAddSeparator">ippAddSeparator</a></li>
          <li><a href="#ippAddString">ippAddString</a></li>
          <li><a href="#ippAddStringf">ippAddStringf</a></li>
          <li><a href="#ippAddStringfv">ippAddStringfv</a></li>
          <li><a href="#ippAddStrings">ippAddStrings</a></li>
          <li><a href="#ippAttributeString">ippAttributeString</a></li>
          <li><a href="#ippContainsInteger">ippContainsInteger</a></li>
          <li><a href="#ippContainsString">ippContainsString</a></li>
          <li><a href="#ippCopyAttribute">ippCopyAttribute</a></li>
          <li><a href="#ippCopyAttributes">ippCopyAttributes</a></li>
          <li><a href="#ippCreateRequestedArray">ippCreateRequestedArray</a></li>
          <li><a href="#ippDateToTime">ippDateToTime</a></li>
          <li><a href="#ippDelete">ippDelete</a></li>
          <li><a href="#ippDeleteAttribute">ippDeleteAttribute</a></li>
          <li><a href="#ippDeleteValues">ippDeleteValues</a></li>
          <li><a href="#ippEnumString">ippEnumString</a></li>
          <li><a href="#ippEnumValue">ippEnumValue</a></li>
          <li><a href="#ippErrorString">ippErrorString</a></li>
          <li><a href="#ippErrorValue">ippErrorValue</a></li>
          <li><a href="#ippFindAttribute">ippFindAttribute</a></li>
          <li><a href="#ippFindNextAttribute">ippFindNextAttribute</a></li>
          <li><a href="#ippFirstAttribute">ippFirstAttribute</a></li>
          <li><a href="#ippGetBoolean">ippGetBoolean</a></li>
          <li><a href="#ippGetCollection">ippGetCollection</a></li>
          <li><a href="#ippGetCount">ippGetCount</a></li>
          <li><a href="#ippGetDate">ippGetDate</a></li>
          <li><a href="#ippGetGroupTag">ippGetGroupTag</a></li>
          <li><a href="#ippGetInteger">ippGetInteger</a></li>
          <li><a href="#ippGetName">ippGetName</a></li>
          <li><a href="#ippGetOctetString">ippGetOctetString</a></li>
          <li><a href="#ippGetOperation">ippGetOperation</a></li>
          <li><a href="#ippGetRange">ippGetRange</a></li>
          <li><a href="#ippGetRequestId">ippGetRequestId</a></li>
          <li><a href="#ippGetResolution">ippGetResolution</a></li>
          <li><a href="#ippGetState">ippGetState</a></li>
          <li><a href="#ippGetStatusCode">ippGetStatusCode</a></li>
          <li><a href="#ippGetString">ippGetString</a></li>
          <li><a href="#ippGetValueTag">ippGetValueTag</a></li>
          <li><a href="#ippGetVersion">ippGetVersion</a></li>
          <li><a href="#ippLength">ippLength</a></li>
          <li><a href="#ippNew">ippNew</a></li>
          <li><a href="#ippNewRequest">ippNewRequest</a></li>
          <li><a href="#ippNewResponse">ippNewResponse</a></li>
          <li><a href="#ippNextAttribute">ippNextAttribute</a></li>
          <li><a href="#ippOpString">ippOpString</a></li>
          <li><a href="#ippOpValue">ippOpValue</a></li>
          <li><a href="#ippPort">ippPort</a></li>
          <li><a href="#ippRead">ippRead</a></li>
          <li><a href="#ippReadFile">ippReadFile</a></li>
          <li><a href="#ippReadIO">ippReadIO</a></li>
          <li><a href="#ippSetBoolean">ippSetBoolean</a></li>
          <li><a href="#ippSetCollection">ippSetCollection</a></li>
          <li><a href="#ippSetDate">ippSetDate</a></li>
          <li><a href="#ippSetGroupTag">ippSetGroupTag</a></li>
          <li><a href="#ippSetInteger">ippSetInteger</a></li>
          <li><a href="#ippSetName">ippSetName</a></li>
          <li><a href="#ippSetOctetString">ippSetOctetString</a></li>
          <li><a href="#ippSetOperation">ippSetOperation</a></li>
          <li><a href="#ippSetPort">ippSetPort</a></li>
          <li><a href="#ippSetRange">ippSetRange</a></li>
          <li><a href="#ippSetRequestId">ippSetRequestId</a></li>
          <li><a href="#ippSetResolution">ippSetResolution</a></li>
          <li><a href="#ippSetState">ippSetState</a></li>
          <li><a href="#ippSetStatusCode">ippSetStatusCode</a></li>
          <li><a href="#ippSetString">ippSetString</a></li>
          <li><a href="#ippSetStringf">ippSetStringf</a></li>
          <li><a href="#ippSetStringfv">ippSetStringfv</a></li>
          <li><a href="#ippSetValueTag">ippSetValueTag</a></li>
          <li><a href="#ippSetVersion">ippSetVersion</a></li>
          <li><a href="#ippStateString">ippStateString</a></li>
          <li><a href="#ippTagString">ippTagString</a></li>
          <li><a href="#ippTagValue">ippTagValue</a></li>
          <li><a href="#ippTimeToDate">ippTimeToDate</a></li>
          <li><a href="#ippValidateAttribute">ippValidateAttribute</a></li>
          <li><a href="#ippValidateAttributes">ippValidateAttributes</a></li>
          <li><a href="#ippWrite">ippWrite</a></li>
          <li><a href="#ippWriteFile">ippWriteFile</a></li>
          <li><a href="#ippWriteIO">ippWriteIO</a></li>
        </ul></li>
        <li><a href="#TYPES">Data Types</a><ul class="subcontents">
          <li><a href="#cups_client_cert_cb_t">cups_client_cert_cb_t</a></li>
          <li><a href="#cups_dest_cb_t">cups_dest_cb_t</a></li>
          <li><a href="#cups_dest_t">cups_dest_t</a></li>
          <li><a href="#cups_dinfo_t">cups_dinfo_t</a></li>
          <li><a href="#cups_job_t">cups_job_t</a></li>
          <li><a href="#cups_option_t">cups_option_t</a></li>
          <li><a href="#cups_password_cb2_t">cups_password_cb2_t</a></li>
          <li><a href="#cups_ptype_t">cups_ptype_t</a></li>
          <li><a href="#cups_server_cert_cb_t">cups_server_cert_cb_t</a></li>
          <li><a href="#cups_size_t">cups_size_t</a></li>
          <li><a href="#http_addr_t">http_addr_t</a></li>
          <li><a href="#http_encoding_t">http_encoding_t</a></li>
          <li><a href="#http_encryption_t">http_encryption_t</a></li>
          <li><a href="#http_field_t">http_field_t</a></li>
          <li><a href="#http_keepalive_t">http_keepalive_t</a></li>
          <li><a href="#http_state_t">http_state_t</a></li>
          <li><a href="#http_t">http_t</a></li>
          <li><a href="#http_timeout_cb_t">http_timeout_cb_t</a></li>
          <li><a href="#http_trust_t">http_trust_t</a></li>
          <li><a href="#http_uri_coding_t">http_uri_coding_t</a></li>
          <li><a href="#http_uri_status_t">http_uri_status_t</a></li>
          <li><a href="#ipp_attribute_t">ipp_attribute_t</a></li>
          <li><a href="#ipp_copycb_t">ipp_copycb_t</a></li>
          <li><a href="#ipp_iocb_t">ipp_iocb_t</a></li>
          <li><a href="#ipp_orient_t">ipp_orient_t</a></li>
          <li><a href="#ipp_pstate_t">ipp_pstate_t</a></li>
          <li><a href="#ipp_quality_t">ipp_quality_t</a></li>
          <li><a href="#ipp_res_t">ipp_res_t</a></li>
          <li><a href="#ipp_rstate_t">ipp_rstate_t</a></li>
          <li><a href="#ipp_sstate_t">ipp_sstate_t</a></li>
          <li><a href="#ipp_state_t">ipp_state_t</a></li>
          <li><a href="#ipp_t">ipp_t</a></li>
        </ul></li>
        <li><a href="#STRUCTURES">Structures</a><ul class="subcontents">
          <li><a href="#cups_dest_s">cups_dest_s</a></li>
          <li><a href="#cups_job_s">cups_job_s</a></li>
          <li><a href="#cups_option_s">cups_option_s</a></li>
          <li><a href="#cups_size_s">cups_size_s</a></li>
        </ul></li>
        <li><a href="#ENUMERATIONS">Enumerations</a><ul class="subcontents">
          <li><a href="#cups_ptype_e">cups_ptype_e</a></li>
          <li><a href="#http_encoding_e">http_encoding_e</a></li>
          <li><a href="#http_encryption_e">http_encryption_e</a></li>
          <li><a href="#http_field_e">http_field_e</a></li>
          <li><a href="#http_keepalive_e">http_keepalive_e</a></li>
          <li><a href="#http_state_e">http_state_e</a></li>
          <li><a href="#http_status_e">http_status_e</a></li>
          <li><a href="#http_trust_e">http_trust_e</a></li>
          <li><a href="#http_uri_coding_e">http_uri_coding_e</a></li>
          <li><a href="#http_uri_status_e">http_uri_status_e</a></li>
          <li><a href="#ipp_finishings_e">ipp_finishings_e</a></li>
          <li><a href="#ipp_jstate_e">ipp_jstate_e</a></li>
          <li><a href="#ipp_op_e">ipp_op_e</a></li>
          <li><a href="#ipp_orient_e">ipp_orient_e</a></li>
          <li><a href="#ipp_pstate_e">ipp_pstate_e</a></li>
          <li><a href="#ipp_quality_e">ipp_quality_e</a></li>
          <li><a href="#ipp_res_e">ipp_res_e</a></li>
          <li><a href="#ipp_rstate_e">ipp_rstate_e</a></li>
          <li><a href="#ipp_sstate_e">ipp_sstate_e</a></li>
          <li><a href="#ipp_state_e">ipp_state_e</a></li>
          <li><a href="#ipp_status_e">ipp_status_e</a></li>
          <li><a href="#ipp_tag_e">ipp_tag_e</a></li>
        </ul></li>
      </ul>
    </div>
    <div class="body">
    <blockquote>
    <p>Please <a href="https://github.com/apple/cups/issues">file issues on Github</a> to provide feedback on this document.</p>
</blockquote>
    <h2><a id="introduction">Introduction</a></h2>
    <p>CUPS provides the &quot;cups&quot; library to talk to the different parts of CUPS and with Internet Printing Protocol (IPP) printers. The &quot;cups&quot; library functions are accessed by including the <code>&lt;cups/cups.h&gt;</code> header.</p>
    <p>CUPS is based on the Internet Printing Protocol (&quot;IPP&quot;), which allows clients (applications) to communicate with a server (the scheduler, printers, etc.) to get a list of destinations, send print jobs, and so forth. You identify which server you want to communicate with using a pointer to the opaque structure <code>http_t</code>. The <code>CUPS_HTTP_DEFAULT</code> constant can be used when you want to talk to the CUPS scheduler.</p>
    <h3><a id="guidelines">Guidelines</a></h3>
    <p>When writing software (other than printer drivers) that uses the &quot;cups&quot; library:</p>
    <ul>
    <li>Do not use undocumented or deprecated APIs,</li>
    <li>Do not rely on pre-configured printers,</li>
    <li>Do not assume that printers support specific features or formats, and</li>
    <li>Do not rely on implementation details (PPDs, etc.)</li>
</ul>
    <p>CUPS is designed to insulate users and developers from the implementation details of printers and file formats. The goal is to allow an application to supply a print file in a standard format with the user intent (&quot;print four copies, two-sided on A4 media, and staple each copy&quot;) and have the printing system manage the printer communication and format conversion needed.</p>
    <p>Similarly, printer and job management applications can use standard query operations to obtain the status information in a common, generic form and use standard management operations to control the state of those printers and jobs.</p>
    <blockquote>
    <p><strong>Note:</strong></p>
    <p>CUPS printer drivers necessarily depend on specific file formats and certain implementation details of the CUPS software. Please consult the Postscript and raster printer driver developer documentation on <a href="https://www.cups.org/documentation.html">CUPS.org</a> for more information.</p>
</blockquote>
    <h3><a id="terms-used-in-this-document">Terms Used in This Document</a></h3>
    <p>A <em>Destination</em> is a printer or print queue that accepts print jobs. A <em>Print</em> <em>Job</em> is a collection of one or more documents that are processed by a destination using options supplied when creating the job. A <em>Document</em> is a file (JPEG image, PDF file, etc.) suitable for printing. An <em>Option</em> controls some aspect of printing, such as the media used. <em>Media</em> is the sheets or roll that is printed on. An <em>Attribute</em> is an option encoded for an Internet Printing Protocol (IPP) request.</p>
    <h3><a id="compiling-programs-that-use-the-cups-api">Compiling Programs That Use the CUPS API</a></h3>
    <p>The CUPS libraries can be used from any C, C++, or Objective C program. The method of compiling against the libraries varies depending on the operating system and installation of CUPS. The following sections show how to compile a simple program (shown below) in two common environments.</p>
    <p>The following simple program lists the available destinations:</p>
    <pre><code>#include &lt;stdio.h&gt;
#include &lt;cups/cups.h&gt;

int print_dest(void *user_data, unsigned flags, cups_dest_t *dest)
{
  if (dest-&gt;instance)
    printf(&quot;%s/%s\n&quot;, dest-&gt;name, dest-&gt;instance);
  else
    puts(dest-&gt;name);

  return (1);
}

int main(void)
{
  cupsEnumDests(CUPS_DEST_FLAGS_NONE, 1000, NULL, 0, 0, print_dest, NULL);

  return (0);
}
</code></pre>
    <h4><a id="compiling-with-xcode">Compiling with Xcode</a></h4>
    <p>In Xcode, choose <em>New</em> <em>Project...</em> from the <em>File</em> menu (or press SHIFT+CMD+N), then select the <em>Command</em> <em>Line</em> <em>Tool</em> under the macOS Application project type. Click <em>Next</em> and enter a name for the project, for example &quot;firstcups&quot;. Click <em>Next</em> and choose a project directory. The click <em>Next</em> to create the project.</p>
    <p>In the project window, click on the <em>Build</em> <em>Phases</em> group and expand the <em>Link</em> <em>Binary</em> <em>with</em> <em>Libraries</em> section. Click <em>+</em>, type &quot;libcups&quot; to show the library, and then double-click on <code>libcups.tbd</code>.</p>
    <p>Finally, click on the <code>main.c</code> file in the sidebar and copy the example program to the file. Build and run (CMD+R) to see the list of destinations.</p>
    <h4><a id="compiling-with-gcc">Compiling with GCC</a></h4>
    <p>From the command-line, create a file called <code>simple.c</code> using your favorite editor, copy the example to this file, and save. Then run the following command to compile it with GCC and run it:</p>
    <pre><code>gcc -o simple `cups-config --cflags` simple.c `cups-config --libs`
./simple
</code></pre>
    <p>The <code>cups-config</code> command provides the compiler flags (<code>cups-config --cflags</code>) and libraries (<code>cups-config --libs</code>) needed for the local system.</p>
    <h2><a id="working-with-destinations">Working with Destinations</a></h2>
    <p>Destinations, which in CUPS represent individual printers or classes (collections or pools) of printers, are represented by the <code>cups_dest_t</code> structure which includes the name (<code>name</code>), instance (<code>instance</code>, saved options/settings), whether the destination is the default for the user (<code>is_default</code>), and the options and basic information associated with that destination (<code>num_options</code> and <code>options</code>).</p>
    <p>Historically destinations have been manually maintained by the administrator of a system or network, but CUPS also supports dynamic discovery of destinations on the current network.</p>
    <h3><a id="finding-available-destinations">Finding Available Destinations</a></h3>
    <p>The <code>cupsEnumDests</code> function finds all of the available destinations:</p>
    <pre><code> int
 cupsEnumDests(unsigned flags, int msec, int *cancel,
               cups_ptype_t type, cups_ptype_t mask,
               cups_dest_cb_t cb, void *user_data)
</code></pre>
    <p>The <code>flags</code> argument specifies enumeration options, which at present must be <code>CUPS_DEST_FLAGS_NONE</code>.</p>
    <p>The <code>msec</code> argument specifies the maximum amount of time that should be used for enumeration in milliseconds - interactive applications should keep this value to 5000 or less when run on the main thread.</p>
    <p>The <code>cancel</code> argument points to an integer variable that, when set to a non-zero value, will cause enumeration to stop as soon as possible. It can be <code>NULL</code> if not needed.</p>
    <p>The <code>type</code> and <code>mask</code> arguments are bitfields that allow the caller to filter the destinations based on categories and/or capabilities. The destination's &quot;printer-type&quot; value is masked by the <code>mask</code> value and compared to the <code>type</code> value when filtering. For example, to only enumerate destinations that are hosted on the local system, pass <code>CUPS_PRINTER_LOCAL</code> for the <code>type</code> argument and <code>CUPS_PRINTER_DISCOVERED</code> for the <code>mask</code> argument. The following constants can be used for filtering:</p>
    <ul>
    <li><code>CUPS_PRINTER_CLASS</code>: A collection of destinations.</li>
    <li><code>CUPS_PRINTER_FAX</code>: A facsimile device.</li>
    <li><code>CUPS_PRINTER_LOCAL</code>: A local printer or class. This constant has the value 0 (no bits set) and is only used for the <code>type</code> argument and is paired with the <code>CUPS_PRINTER_REMOTE</code> or <code>CUPS_PRINTER_DISCOVERED</code> constant passed in the <code>mask</code> argument.</li>
    <li><code>CUPS_PRINTER_REMOTE</code>: A remote (shared) printer or class.</li>
    <li><code>CUPS_PRINTER_DISCOVERED</code>: An available network printer or class.</li>
    <li><code>CUPS_PRINTER_BW</code>: Can do B&amp;W printing.</li>
    <li><code>CUPS_PRINTER_COLOR</code>: Can do color printing.</li>
    <li><code>CUPS_PRINTER_DUPLEX</code>: Can do two-sided printing.</li>
    <li><code>CUPS_PRINTER_STAPLE</code>: Can staple output.</li>
    <li><code>CUPS_PRINTER_COLLATE</code>: Can quickly collate copies.</li>
    <li><code>CUPS_PRINTER_PUNCH</code>: Can punch output.</li>
    <li><code>CUPS_PRINTER_COVER</code>: Can cover output.</li>
    <li><code>CUPS_PRINTER_BIND</code>: Can bind output.</li>
    <li><code>CUPS_PRINTER_SORT</code>: Can sort output (mailboxes, etc.)</li>
    <li><code>CUPS_PRINTER_SMALL</code>: Can print on Letter/Legal/A4-size media.</li>
    <li><code>CUPS_PRINTER_MEDIUM</code>: Can print on Tabloid/B/C/A3/A2-size media.</li>
    <li><code>CUPS_PRINTER_LARGE</code>: Can print on D/E/A1/A0-size media.</li>
    <li><code>CUPS_PRINTER_VARIABLE</code>: Can print on rolls and custom-size media.</li>
</ul>
    <p>The <code>cb</code> argument specifies a function to call for every destination that is found:</p>
    <pre><code>typedef int (*cups_dest_cb_t)(void *user_data,
                              unsigned flags,
                              cups_dest_t *dest);
</code></pre>
    <p>The callback function receives a copy of the <code>user_data</code> argument along with a bitfield (<code>flags</code>) and the destination that was found. The <code>flags</code> argument can have any of the following constant (bit) values set:</p>
    <ul>
    <li><code>CUPS_DEST_FLAGS_MORE</code>: There are more destinations coming.</li>
    <li><code>CUPS_DEST_FLAGS_REMOVED</code>: The destination has gone away and should be removed from the list of destinations a user can select.</li>
    <li><code>CUPS_DEST_FLAGS_ERROR</code>: An error occurred. The reason for the error can be found by calling the <code>cupsLastError</code> and/or <code>cupsLastErrorString</code> functions.</li>
</ul>
    <p>The callback function returns 0 to stop enumeration or 1 to continue.</p>
    <blockquote>
    <p><strong>Note:</strong></p>
    <p>The callback function will likely be called multiple times for the same destination, so it is up to the caller to suppress any duplicate destinations.</p>
</blockquote>
    <p>The following example shows how to use <code>cupsEnumDests</code> to get a filtered array of destinations:</p>
    <pre><code>typedef struct
{
  int num_dests;
  cups_dest_t *dests;
} my_user_data_t;

int
my_dest_cb(my_user_data_t *user_data, unsigned flags,
           cups_dest_t *dest)
{
  if (flags &amp; CUPS_DEST_FLAGS_REMOVED)
  {
   /*
    * Remove destination from array...
    */

    user_data-&gt;num_dests =
        cupsRemoveDest(dest-&gt;name, dest-&gt;instance,
                       user_data-&gt;num_dests,
                       &amp;(user_data-&gt;dests));
  }
  else
  {
   /*
    * Add destination to array...
    */

    user_data-&gt;num_dests =
        cupsCopyDest(dest, user_data-&gt;num_dests,
                     &amp;(user_data-&gt;dests));
  }

  return (1);
}

int
my_get_dests(cups_ptype_t type, cups_ptype_t mask,
             cups_dest_t **dests)
{
  my_user_data_t user_data = { 0, NULL };

  if (!cupsEnumDests(CUPS_DEST_FLAGS_NONE, 1000, NULL, type,
                     mask, (cups_dest_cb_t)my_dest_cb,
                     &amp;user_data))
  {
   /*
    * An error occurred, free all of the destinations and
    * return...
    */

    cupsFreeDests(user_data.num_dests, user_dasta.dests);

    *dests = NULL;

    return (0);
  }

 /*
  * Return the destination array...
  */

  *dests = user_data.dests;

  return (user_data.num_dests);
}
</code></pre>
    <h3><a id="basic-destination-information">Basic Destination Information</a></h3>
    <p>The <code>num_options</code> and <code>options</code> members of the <code>cups_dest_t</code> structure provide basic attributes about the destination in addition to the user default options and values for that destination. The following names are predefined for various destination attributes:</p>
    <ul>
    <li>&quot;auth-info-required&quot;: The type of authentication required for printing to this destination: &quot;none&quot;, &quot;username,password&quot;, &quot;domain,username,password&quot;, or &quot;negotiate&quot; (Kerberos).</li>
    <li>&quot;printer-info&quot;: The human-readable description of the destination such as &quot;My Laser Printer&quot;.</li>
    <li>&quot;printer-is-accepting-jobs&quot;: &quot;true&quot; if the destination is accepting new jobs, &quot;false&quot; otherwise.</li>
    <li>&quot;printer-is-shared&quot;: &quot;true&quot; if the destination is being shared with other computers, &quot;false&quot; otherwise.</li>
    <li>&quot;printer-location&quot;: The human-readable location of the destination such as &quot;Lab 4&quot;.</li>
    <li>&quot;printer-make-and-model&quot;: The human-readable make and model of the destination such as &quot;ExampleCorp LaserPrinter 4000 Series&quot;.</li>
    <li>&quot;printer-state&quot;: &quot;3&quot; if the destination is idle, &quot;4&quot; if the destination is printing a job, and &quot;5&quot; if the destination is stopped.</li>
    <li>&quot;printer-state-change-time&quot;: The UNIX time when the destination entered the current state.</li>
    <li>&quot;printer-state-reasons&quot;: Additional comma-delimited state keywords for the destination such as &quot;media-tray-empty-error&quot; and &quot;toner-low-warning&quot;.</li>
    <li>&quot;printer-type&quot;: The <code>cups_ptype_t</code> value associated with the destination.</li>
    <li>&quot;printer-uri-supported&quot;: The URI associated with the destination; if not set, this destination was discovered but is not yet setup as a local printer.</li>
</ul>
    <p>Use the <code>cupsGetOption</code> function to retrieve the value. For example, the following code gets the make and model of a destination:</p>
    <pre><code>const char *model = cupsGetOption(&quot;printer-make-and-model&quot;,
                                  dest-&gt;num_options,
                                  dest-&gt;options);
</code></pre>
    <h3><a id="detailed-destination-information">Detailed Destination Information</a></h3>
    <p>Once a destination has been chosen, the <code>cupsCopyDestInfo</code> function can be used to gather detailed information about the destination:</p>
    <pre><code>cups_dinfo_t *
cupsCopyDestInfo(http_t *http, cups_dest_t *dest);
</code></pre>
    <p>The <code>http</code> argument specifies a connection to the CUPS scheduler and is typically the constant <code>CUPS_HTTP_DEFAULT</code>. The <code>dest</code> argument specifies the destination to query.</p>
    <p>The <code>cups_dinfo_t</code> structure that is returned contains a snapshot of the supported options and their supported, ready, and default values. It also can report constraints between different options and values, and recommend changes to resolve those constraints.</p>
    <h4><a id="getting-supported-options-and-values">Getting Supported Options and Values</a></h4>
    <p>The <code>cupsCheckDestSupported</code> function can be used to test whether a particular option or option and value is supported:</p>
    <pre><code>int
cupsCheckDestSupported(http_t *http, cups_dest_t *dest,
                       cups_dinfo_t *info,
                       const char *option,
                       const char *value);
</code></pre>
    <p>The <code>option</code> argument specifies the name of the option to check. The following constants can be used to check the various standard options:</p>
    <ul>
    <li><code>CUPS_COPIES</code>: Controls the number of copies that are produced.</li>
    <li><code>CUPS_FINISHINGS</code>: A comma-delimited list of integer constants that control the finishing processes that are applied to the job, including stapling, punching, and folding.</li>
    <li><code>CUPS_MEDIA</code>: Controls the media size that is used, typically one of the following: <code>CUPS_MEDIA_3X5</code>, <code>CUPS_MEDIA_4X6</code>, <code>CUPS_MEDIA_5X7</code>, <code>CUPS_MEDIA_8X10</code>, <code>CUPS_MEDIA_A3</code>, <code>CUPS_MEDIA_A4</code>, <code>CUPS_MEDIA_A5</code>, <code>CUPS_MEDIA_A6</code>, <code>CUPS_MEDIA_ENV10</code>, <code>CUPS_MEDIA_ENVDL</code>, <code>CUPS_MEDIA_LEGAL</code>, <code>CUPS_MEDIA_LETTER</code>, <code>CUPS_MEDIA_PHOTO_L</code>, <code>CUPS_MEDIA_SUPERBA3</code>, or <code>CUPS_MEDIA_TABLOID</code>.</li>
    <li><code>CUPS_MEDIA_SOURCE</code>: Controls where the media is pulled from, typically either <code>CUPS_MEDIA_SOURCE_AUTO</code> or <code>CUPS_MEDIA_SOURCE_MANUAL</code>.</li>
    <li><code>CUPS_MEDIA_TYPE</code>: Controls the type of media that is used, typically one of the following: <code>CUPS_MEDIA_TYPE_AUTO</code>, <code>CUPS_MEDIA_TYPE_ENVELOPE</code>, <code>CUPS_MEDIA_TYPE_LABELS</code>, <code>CUPS_MEDIA_TYPE_LETTERHEAD</code>, <code>CUPS_MEDIA_TYPE_PHOTO</code>, <code>CUPS_MEDIA_TYPE_PHOTO_GLOSSY</code>, <code>CUPS_MEDIA_TYPE_PHOTO_MATTE</code>, <code>CUPS_MEDIA_TYPE_PLAIN</code>, or <code>CUPS_MEDIA_TYPE_TRANSPARENCY</code>.</li>
    <li><code>CUPS_NUMBER_UP</code>: Controls the number of document pages that are placed on each media side.</li>
    <li><code>CUPS_ORIENTATION</code>: Controls the orientation of document pages placed on the media: <code>CUPS_ORIENTATION_PORTRAIT</code> or <code>CUPS_ORIENTATION_LANDSCAPE</code>.</li>
    <li><code>CUPS_PRINT_COLOR_MODE</code>: Controls whether the output is in color (<code>CUPS_PRINT_COLOR_MODE_COLOR</code>), grayscale (<code>CUPS_PRINT_COLOR_MODE_MONOCHROME</code>), or either (<code>CUPS_PRINT_COLOR_MODE_AUTO</code>).</li>
    <li><code>CUPS_PRINT_QUALITY</code>: Controls the generate quality of the output: <code>CUPS_PRINT_QUALITY_DRAFT</code>, <code>CUPS_PRINT_QUALITY_NORMAL</code>, or <code>CUPS_PRINT_QUALITY_HIGH</code>.</li>
    <li><code>CUPS_SIDES</code>: Controls whether prints are placed on one or both sides of the media: <code>CUPS_SIDES_ONE_SIDED</code>, <code>CUPS_SIDES_TWO_SIDED_PORTRAIT</code>, or <code>CUPS_SIDES_TWO_SIDED_LANDSCAPE</code>.</li>
</ul>
    <p>If the <code>value</code> argument is <code>NULL</code>, the <code>cupsCheckDestSupported</code> function returns whether the option is supported by the destination. Otherwise, the function returns whether the specified value of the option is supported.</p>
    <p>The <code>cupsFindDestSupported</code> function returns the IPP attribute containing the supported values for a given option:</p>
    <pre><code> ipp_attribute_t *
 cupsFindDestSupported(http_t *http, cups_dest_t *dest,
                       cups_dinfo_t *dinfo,
                       const char *option);
</code></pre>
    <p>For example, the following code prints the supported finishing processes for a destination, if any, to the standard output:</p>
    <pre><code>cups_dinfo_t *info = cupsCopyDestInfo(CUPS_HTTP_DEFAULT,
                                      dest);

if (cupsCheckDestSupported(CUPS_HTTP_DEFAULT, dest, info,
                           CUPS_FINISHINGS, NULL))
{
  ipp_attribute_t *finishings =
      cupsFindDestSupported(CUPS_HTTP_DEFAULT, dest, info,
                            CUPS_FINISHINGS);
  int i, count = ippGetCount(finishings);

  puts(&quot;finishings supported:&quot;);
  for (i = 0; i &lt; count; i ++)
    printf(&quot;  %d\n&quot;, ippGetInteger(finishings, i));
}
else
  puts(&quot;finishings not supported.&quot;);
</code></pre>
    <p>The &quot;job-creation-attributes&quot; option can be queried to get a list of supported options. For example, the following code prints the list of supported options to the standard output:</p>
    <pre><code>ipp_attribute_t *attrs =
    cupsFindDestSupported(CUPS_HTTP_DEFAULT, dest, info,
                          &quot;job-creation-attributes&quot;);
int i, count = ippGetCount(attrs);

for (i = 0; i &lt; count; i ++)
  puts(ippGetString(attrs, i, NULL));
</code></pre>
    <h4><a id="getting-default-values">Getting Default Values</a></h4>
    <p>There are two sets of default values - user defaults that are available via the <code>num_options</code> and <code>options</code> members of the <code>cups_dest_t</code> structure, and destination defaults that available via the <code>cups_dinfo_t</code> structure and the <code>cupsFindDestDefault</code> function which returns the IPP attribute containing the default value(s) for a given option:</p>
    <pre><code>ipp_attribute_t *
cupsFindDestDefault(http_t *http, cups_dest_t *dest,
                    cups_dinfo_t *dinfo,
                    const char *option);
</code></pre>
    <p>The user defaults from <code>cupsGetOption</code> should always take preference over the destination defaults. For example, the following code prints the default finishings value(s) to the standard output:</p>
    <pre><code>const char *def_value =
    cupsGetOption(CUPS_FINISHINGS, dest-&gt;num_options,
                  dest-&gt;options);
ipp_attribute_t *def_attr =
    cupsFindDestDefault(CUPS_HTTP_DEFAULT, dest, info,
                        CUPS_FINISHINGS);

if (def_value != NULL)
{
  printf(&quot;Default finishings: %s\n&quot;, def_value);
}
else
{
  int i, count = ippGetCount(def_attr);

  printf(&quot;Default finishings: %d&quot;,
         ippGetInteger(def_attr, 0));
  for (i = 1; i &lt; count; i ++)
    printf(&quot;,%d&quot;, ippGetInteger(def_attr, i));
  putchar('\n');
}
</code></pre>
    <h4><a id="getting-ready-loaded-values">Getting Ready (Loaded) Values</a></h4>
    <p>The finishings and media options also support queries for the ready, or loaded, values. For example, a printer may have punch and staple finishers installed but be out of staples - the supported values will list both punch and staple finishing processes but the ready values will only list the punch processes. Similarly, a printer may support hundreds of different sizes of media but only have a single size loaded at any given time - the ready values are limited to the media that is actually in the printer.</p>
    <p>The <code>cupsFindDestReady</code> function finds the IPP attribute containing the ready values for a given option:</p>
    <pre><code>ipp_attribute_t *
cupsFindDestReady(http_t *http, cups_dest_t *dest,
                  cups_dinfo_t *dinfo, const char *option);
</code></pre>
    <p>For example, the following code lists the ready finishing processes:</p>
    <pre><code>ipp_attribute_t *ready_finishings =
    cupsFindDestReady(CUPS_HTTP_DEFAULT, dest, info,
                      CUPS_FINISHINGS);

if (ready_finishings != NULL)
{
  int i, count = ippGetCount(ready_finishings);

  puts(&quot;finishings ready:&quot;);
  for (i = 0; i &lt; count; i ++)
    printf(&quot;  %d\n&quot;, ippGetInteger(ready_finishings, i));
}
else
  puts(&quot;no finishings are ready.&quot;);
</code></pre>
    <h4><a id="media-size-options">Media Size Options</a></h4>
    <p>CUPS provides functions for querying the dimensions and margins for each of the supported media size options. The <code>cups_size_t</code> structure is used to describe a media size:</p>
    <pre><code>typedef struct cups_size_s
{
  char media[128];
  int width, length;
  int bottom, left, right, top;
} cups_size_t;
</code></pre>
    <p>The <code>width</code> and <code>length</code> members specify the dimensions of the media in hundredths of millimeters (1/2540th of an inch). The <code>bottom</code>, <code>left</code>, <code>right</code>, and <code>top</code> members specify the margins of the printable area, also in hundredths of millimeters.</p>
    <p>The <code>cupsGetDestMediaByName</code> and <code>cupsGetDestMediaBySize</code> functions lookup the media size information using a standard media size name or dimensions in hundredths of millimeters:</p>
    <pre><code>int
cupsGetDestMediaByName(http_t *http, cups_dest_t *dest,
                       cups_dinfo_t *dinfo,
                       const char *media,
                       unsigned flags, cups_size_t *size);

int
cupsGetDestMediaBySize(http_t *http, cups_dest_t *dest,
                       cups_dinfo_t *dinfo,
                       int width, int length,
                       unsigned flags, cups_size_t *size);
</code></pre>
    <p>The <code>media</code>, <code>width</code>, and <code>length</code> arguments specify the size to lookup. The <code>flags</code> argument specifies a bitfield controlling various lookup options:</p>
    <ul>
    <li><code>CUPS_MEDIA_FLAGS_DEFAULT</code>: Find the closest size supported by the printer.</li>
    <li><code>CUPS_MEDIA_FLAGS_BORDERLESS</code>: Find a borderless size.</li>
    <li><code>CUPS_MEDIA_FLAGS_DUPLEX</code>: Find a size compatible with two-sided printing.</li>
    <li><code>CUPS_MEDIA_FLAGS_EXACT</code>: Find an exact match for the size.</li>
    <li><code>CUPS_MEDIA_FLAGS_READY</code>: If the printer supports media sensing or configuration of the media in each tray/source, find the size amongst the &quot;ready&quot; media.</li>
</ul>
    <p>If a matching size is found for the destination, the size information is stored in the structure pointed to by the <code>size</code> argument and 1 is returned. Otherwise 0 is returned.</p>
    <p>For example, the following code prints the margins for two-sided printing on US Letter media:</p>
    <pre><code>cups_size_t size;

if (cupsGetDestMediaByName(CUPS_HTTP_DEFAULT, dest, info,
                           CUPS_MEDIA_LETTER,
                           CUPS_MEDIA_FLAGS_DUPLEX, &amp;size))
{
  puts(&quot;Margins for duplex US Letter:&quot;);
  printf(&quot;  Bottom: %.2fin\n&quot;, size.bottom / 2540.0);
  printf(&quot;    Left: %.2fin\n&quot;, size.left / 2540.0);
  printf(&quot;   Right: %.2fin\n&quot;, size.right / 2540.0);
  printf(&quot;     Top: %.2fin\n&quot;, size.top / 2540.0);
}
else
  puts(&quot;Margins for duplex US Letter are not available.&quot;);
</code></pre>
    <p>You can also enumerate all of the sizes that match a given <code>flags</code> value using the <code>cupsGetDestMediaByIndex</code> and <code>cupsGetDestMediaCount</code> functions:</p>
    <pre><code>int
cupsGetDestMediaByIndex(http_t *http, cups_dest_t *dest,
                        cups_dinfo_t *dinfo, int n,
                        unsigned flags, cups_size_t *size);

int
cupsGetDestMediaCount(http_t *http, cups_dest_t *dest,
                      cups_dinfo_t *dinfo, unsigned flags);
</code></pre>
    <p>For example, the following code prints the list of ready media and corresponding margins:</p>
    <pre><code>cups_size_t size;
int i;
int count = cupsGetDestMediaCount(CUPS_HTTP_DEFAULT,
                                  dest, info,
                                  CUPS_MEDIA_FLAGS_READY);

for (i = 0; i &lt; count; i ++)
{
  if (cupsGetDestMediaByIndex(CUPS_HTTP_DEFAULT, dest, info,
                              i, CUPS_MEDIA_FLAGS_READY,
                              &amp;size))
  {
    printf(&quot;%s:\n&quot;, size.name);
    printf(&quot;   Width: %.2fin\n&quot;, size.width / 2540.0);
    printf(&quot;  Length: %.2fin\n&quot;, size.length / 2540.0);
    printf(&quot;  Bottom: %.2fin\n&quot;, size.bottom / 2540.0);
    printf(&quot;    Left: %.2fin\n&quot;, size.left / 2540.0);
    printf(&quot;   Right: %.2fin\n&quot;, size.right / 2540.0);
    printf(&quot;     Top: %.2fin\n&quot;, size.top / 2540.0);
  }
}
</code></pre>
    <p>Finally, the <code>cupsGetDestMediaDefault</code> function returns the default media size:</p>
    <pre><code>int
cupsGetDestMediaDefault(http_t *http, cups_dest_t *dest,
                        cups_dinfo_t *dinfo, unsigned flags,
                        cups_size_t *size);
</code></pre>
    <h4><a id="localizing-options-and-values">Localizing Options and Values</a></h4>
    <p>CUPS provides three functions to get localized, human-readable strings in the user's current locale for options and values: <code>cupsLocalizeDestMedia</code>, <code>cupsLocalizeDestOption</code>, and <code>cupsLocalizeDestValue</code>:</p>
    <pre><code>const char *
cupsLocalizeDestMedia(http_t *http, cups_dest_t *dest,
                      cups_dinfo_t *info, unsigned flags,
                      cups_size_t *size);

const char *
cupsLocalizeDestOption(http_t *http, cups_dest_t *dest,
                       cups_dinfo_t *info,
                       const char *option);

const char *
cupsLocalizeDestValue(http_t *http, cups_dest_t *dest,
                      cups_dinfo_t *info,
                      const char *option, const char *value);
</code></pre>
    <h3><a id="submitting-a-print-job">Submitting a Print Job</a></h3>
    <p>Once you are ready to submit a print job, you create a job using the <code>cupsCreateDestJob</code> function:</p>
    <pre><code>ipp_status_t
cupsCreateDestJob(http_t *http, cups_dest_t *dest,
                  cups_dinfo_t *info, int *job_id,
                  const char *title, int num_options,
                  cups_option_t *options);
</code></pre>
    <p>The <code>title</code> argument specifies a name for the print job such as &quot;My Document&quot;. The <code>num_options</code> and <code>options</code> arguments specify the options for the print job which are allocated using the <code>cupsAddOption</code> function.</p>
    <p>When successful, the job's numeric identifier is stored in the integer pointed to by the <code>job_id</code> argument and <code>IPP_STATUS_OK</code> is returned. Otherwise, an IPP error status is returned.</p>
    <p>For example, the following code creates a new job that will print 42 copies of a two-sided US Letter document:</p>
    <pre><code>int job_id = 0;
int num_options = 0;
cups_option_t *options = NULL;

num_options = cupsAddOption(CUPS_COPIES, &quot;42&quot;,
                            num_options, &amp;options);
num_options = cupsAddOption(CUPS_MEDIA, CUPS_MEDIA_LETTER,
                            num_options, &amp;options);
num_options = cupsAddOption(CUPS_SIDES,
                            CUPS_SIDES_TWO_SIDED_PORTRAIT,
                            num_options, &amp;options);

if (cupsCreateDestJob(CUPS_HTTP_DEFAULT, dest, info,
                      &amp;job_id, &quot;My Document&quot;, num_options,
                      options) == IPP_STATUS_OK)
  printf(&quot;Created job: %d\n&quot;, job_id);
else
  printf(&quot;Unable to create job: %s\n&quot;,
         cupsLastErrorString());
</code></pre>
    <p>Once the job is created, you submit documents for the job using the <code>cupsStartDestDocument</code>, <code>cupsWriteRequestData</code>, and <code>cupsFinishDestDocument</code> functions:</p>
    <pre><code>http_status_t
cupsStartDestDocument(http_t *http, cups_dest_t *dest,
                      cups_dinfo_t *info, int job_id,
                      const char *docname,
                      const char *format,
                      int num_options,
                      cups_option_t *options,
                      int last_document);

http_status_t
cupsWriteRequestData(http_t *http, const char *buffer,
                     size_t length);

ipp_status_t
cupsFinishDestDocument(http_t *http, cups_dest_t *dest,
                       cups_dinfo_t *info);
</code></pre>
    <p>The <code>docname</code> argument specifies the name of the document, typically the original filename. The <code>format</code> argument specifies the MIME media type of the document, including the following constants:</p>
    <ul>
    <li><code>CUPS_FORMAT_JPEG</code>: &quot;image/jpeg&quot;</li>
    <li><code>CUPS_FORMAT_PDF</code>: &quot;application/pdf&quot;</li>
    <li><code>CUPS_FORMAT_POSTSCRIPT</code>: &quot;application/postscript&quot;</li>
    <li><code>CUPS_FORMAT_TEXT</code>: &quot;text/plain&quot;</li>
</ul>
    <p>The <code>num_options</code> and <code>options</code> arguments specify per-document print options, which at present must be 0 and <code>NULL</code>. The <code>last_document</code> argument specifies whether this is the last document in the job.</p>
    <p>For example, the following code submits a PDF file to the job that was just created:</p>
    <pre><code>FILE *fp = fopen(&quot;filename.pdf&quot;, &quot;rb&quot;);
size_t bytes;
char buffer[65536];

if (cupsStartDestDocument(CUPS_HTTP_DEFAULT, dest, info,
                          job_id, &quot;filename.pdf&quot;, 0, NULL,
                          1) == HTTP_STATUS_CONTINUE)
{
  while ((bytes = fread(buffer, 1, sizeof(buffer), fp)) &gt; 0)
    if (cupsWriteRequestData(CUPS_HTTP_DEFAULT, buffer,
                             bytes) != HTTP_STATUS_CONTINUE)
      break;

  if (cupsFinishDestDocument(CUPS_HTTP_DEFAULT, dest,
                             info) == IPP_STATUS_OK)
    puts(&quot;Document send succeeded.&quot;);
  else
    printf(&quot;Document send failed: %s\n&quot;,
           cupsLastErrorString());
}

fclose(fp);
</code></pre>
    <h2><a id="sending-ipp-requests">Sending IPP Requests</a></h2>
    <p>CUPS provides a rich API for sending IPP requests to the scheduler or printers, typically from management or utility applications whose primary purpose is not to send print jobs.</p>
    <h3><a id="connecting-to-the-scheduler-or-printer">Connecting to the Scheduler or Printer</a></h3>
    <p>The connection to the scheduler or printer is represented by the HTTP connection type <code>http_t</code>. The <code>cupsConnectDest</code> function connects to the scheduler or printer associated with the destination:</p>
    <pre><code>http_t *
cupsConnectDest(cups_dest_t *dest, unsigned flags, int msec,
                int *cancel, char *resource,
                size_t resourcesize, cups_dest_cb_t cb,
                void *user_data);
</code></pre>
    <p>The <code>dest</code> argument specifies the destination to connect to.</p>
    <p>The <code>flags</code> argument specifies whether you want to connect to the scheduler (<code>CUPS_DEST_FLAGS_NONE</code>) or device/printer (<code>CUPS_DEST_FLAGS_DEVICE</code>) associated with the destination.</p>
    <p>The <code>msec</code> argument specifies how long you are willing to wait for the connection to be established in milliseconds. Specify a value of <code>-1</code> to wait indefinitely.</p>
    <p>The <code>cancel</code> argument specifies the address of an integer variable that can be set to a non-zero value to cancel the connection. Specify a value of <code>NULL</code> to not provide a cancel variable.</p>
    <p>The <code>resource</code> and <code>resourcesize</code> arguments specify the address and size of a character string array to hold the path to use when sending an IPP request.</p>
    <p>The <code>cb</code> and <code>user_data</code> arguments specify a destination callback function that returns 1 to continue connecting or 0 to stop. The destination callback work the same way as the one used for the <code>cupsEnumDests</code> function.</p>
    <p>On success, a HTTP connection is returned that can be used to send IPP requests and get IPP responses.</p>
    <p>For example, the following code connects to the printer associated with a destination with a 30 second timeout:</p>
    <pre><code>char resource[256];
http_t *http = cupsConnectDest(dest, CUPS_DEST_FLAGS_DEVICE,
                               30000, NULL, resource,
                               sizeof(resource), NULL, NULL);
</code></pre>
    <h3><a id="creating-an-ipp-request">Creating an IPP Request</a></h3>
    <p>IPP requests are represented by the IPP message type <code>ipp_t</code> and each IPP attribute in the request is representing using the type <code>ipp_attribute_t</code>. Each IPP request includes an operation code (<code>IPP_OP_CREATE_JOB</code>, <code>IPP_OP_GET_PRINTER_ATTRIBUTES</code>, etc.) and a 32-bit integer identifier.</p>
    <p>The <code>ippNewRequest</code> function creates a new IPP request:</p>
    <pre><code>ipp_t *
ippNewRequest(ipp_op_t op);
</code></pre>
    <p>The <code>op</code> argument specifies the IPP operation code for the request. For example, the following code creates an IPP Get-Printer-Attributes request:</p>
    <pre><code>ipp_t *request = ippNewRequest(IPP_OP_GET_PRINTER_ATTRIBUTES);
</code></pre>
    <p>The request identifier is automatically set to a unique value for the current process.</p>
    <p>Each IPP request starts with two IPP attributes, &quot;attributes-charset&quot; and &quot;attributes-natural-language&quot;, followed by IPP attribute(s) that specify the target of the operation. The <code>ippNewRequest</code> automatically adds the correct &quot;attributes-charset&quot; and &quot;attributes-natural-language&quot; attributes, but you must add the target attribute(s). For example, the following code adds the &quot;printer-uri&quot; attribute to the IPP Get-Printer-Attributes request to specify which printer is being queried:</p>
    <pre><code>const char *printer_uri = cupsGetOption(&quot;device-uri&quot;,
                                        dest-&gt;num_options,
                                        dest-&gt;options);

ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
             &quot;printer-uri&quot;, NULL, printer_uri);
</code></pre>
    <blockquote>
    <p><strong>Note:</strong></p>
    <p>If we wanted to query the scheduler instead of the device, we would look up the &quot;printer-uri-supported&quot; option instead of the &quot;device-uri&quot; value.</p>
</blockquote>
    <p>The <code>ippAddString</code> function adds the &quot;printer-uri&quot; attribute the the IPP request. The <code>IPP_TAG_OPERATION</code> argument specifies that the attribute is part of the operation. The <code>IPP_TAG_URI</code> argument specifies that the value is a Universal Resource Identifier (URI) string. The <code>NULL</code> argument specifies there is no language (English, French, Japanese, etc.) associated with the string, and the <code>printer_uri</code> argument specifies the string value.</p>
    <p>The IPP Get-Printer-Attributes request also supports an IPP attribute called &quot;requested-attributes&quot; that lists the attributes and values you are interested in. For example, the following code requests the printer state attributes:</p>
    <pre><code>static const char * const requested_attributes[] =
{
  &quot;printer-state&quot;,
  &quot;printer-state-message&quot;,
  &quot;printer-state-reasons&quot;
};

ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
              &quot;requested-attributes&quot;, 3, NULL,
              requested_attributes);
</code></pre>
    <p>The <code>ippAddStrings</code> function adds an attribute with one or more strings, in this case three. The <code>IPP_TAG_KEYWORD</code> argument specifies that the strings are keyword values, which are used for attribute names. All strings use the same language (<code>NULL</code>), and the attribute will contain the three strings in the array <code>requested_attributes</code>.</p>
    <p>CUPS provides many functions to adding attributes of different types:</p>
    <ul>
    <li><code>ippAddBoolean</code> adds a boolean (<code>IPP_TAG_BOOLEAN</code>) attribute with one value.</li>
    <li><code>ippAddInteger</code> adds an enum (<code>IPP_TAG_ENUM</code>) or integer (<code>IPP_TAG_INTEGER</code>) attribute with one value.</li>
    <li><code>ippAddIntegers</code> adds an enum or integer attribute with one or more values.</li>
    <li><code>ippAddOctetString</code> adds an octetString attribute with one value.</li>
    <li><code>ippAddOutOfBand</code> adds a admin-defined (<code>IPP_TAG_ADMINDEFINE</code>), default (<code>IPP_TAG_DEFAULT</code>), delete-attribute (<code>IPP_TAG_DELETEATTR</code>), no-value (<code>IPP_TAG_NOVALUE</code>), not-settable (<code>IPP_TAG_NOTSETTABLE</code>), unknown (<code>IPP_TAG_UNKNOWN</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_VALUE</code>) out-of-band attribute.</li>
    <li><code>ippAddRange</code> adds a rangeOfInteger attribute with one range.</li>
    <li><code>ippAddRanges</code> adds a rangeOfInteger attribute with one or more ranges.</li>
    <li><code>ippAddResolution</code> adds a resolution attribute with one resolution.</li>
    <li><code>ippAddResolutions</code> adds a resolution attribute with one or more resolutions.</li>
    <li><code>ippAddString</code> adds a charset (<code>IPP_TAG_CHARSET</code>), keyword (<code>IPP_TAG_KEYWORD</code>), mimeMediaType (<code>IPP_TAG_MIMETYPE</code>), name (<code>IPP_TAG_NAME</code> and <code>IPP_TAG_NAMELANG</code>), naturalLanguage (<code>IPP_TAG_NATURAL_LANGUAGE</code>), text (<code>IPP_TAG_TEXT</code> and <code>IPP_TAG_TEXTLANG</code>), uri (<code>IPP_TAG_URI</code>), or uriScheme (<code>IPP_TAG_URISCHEME</code>) attribute with one value.</li>
    <li><code>ippAddStrings</code> adds a charset, keyword, mimeMediaType, name, naturalLanguage, text, uri, or uriScheme attribute with one or more values.</li>
</ul>
    <h3><a id="sending-the-ipp-request">Sending the IPP Request</a></h3>
    <p>Once you have created the IPP request, you can send it using the <code>cupsDoRequest</code> function. For example, the following code sends the IPP Get-Printer-Attributes request to the destination and saves the response:</p>
    <pre><code>ipp_t *response = cupsDoRequest(http, request, resource);
</code></pre>
    <p>For requests like Send-Document that include a file, the <code>cupsDoFileRequest</code> function should be used:</p>
    <pre><code>ipp_t *response = cupsDoFileRequest(http, request, resource,
                                    filename);
</code></pre>
    <p>Both <code>cupsDoRequest</code> and <code>cupsDoFileRequest</code> free the IPP request. If a valid IPP response is received, it is stored in a new IPP message (<code>ipp_t</code>) and returned to the caller. Otherwise <code>NULL</code> is returned.</p>
    <p>The status from the most recent request can be queried using the <code>cupsLastError</code> function, for example:</p>
    <pre><code>if (cupsLastError() &gt;= IPP_STATUS_ERROR_BAD_REQUEST)
{
  /* request failed */
}
</code></pre>
    <p>A human-readable error message is also available using the <code>cupsLastErrorString</code> function:</p>
    <pre><code>if (cupsLastError() &gt;= IPP_STATUS_ERROR_BAD_REQUEST)
{
  /* request failed */
  printf(&quot;Request failed: %s\n&quot;, cupsLastErrorString());
}
</code></pre>
    <h3><a id="processing-the-ipp-response">Processing the IPP Response</a></h3>
    <p>Each response to an IPP request is also an IPP message (<code>ipp_t</code>) with its own IPP attributes (<code>ipp_attribute_t</code>) that includes a status code (<code>IPP_STATUS_OK</code>, <code>IPP_STATUS_ERROR_BAD_REQUEST</code>, etc.) and the corresponding 32-bit integer identifier from the request.</p>
    <p>For example, the following code finds the printer state attributes and prints their values:</p>
    <pre><code>ipp_attribute_t *attr;

if ((attr = ippFindAttribute(response, &quot;printer-state&quot;,
                             IPP_TAG_ENUM)) != NULL)
{
  printf(&quot;printer-state=%s\n&quot;,
         ippEnumString(&quot;printer-state&quot;, ippGetInteger(attr, 0)));
}
else
  puts(&quot;printer-state=unknown&quot;);

if ((attr = ippFindAttribute(response, &quot;printer-state-message&quot;,
                             IPP_TAG_TEXT)) != NULL)
{
  printf(&quot;printer-state-message=\&quot;%s\&quot;\n&quot;,
         ippGetString(attr, 0, NULL)));
}

if ((attr = ippFindAttribute(response, &quot;printer-state-reasons&quot;,
                             IPP_TAG_KEYWORD)) != NULL)
{
  int i, count = ippGetCount(attr);

  puts(&quot;printer-state-reasons=&quot;);
  for (i = 0; i &lt; count; i ++)
    printf(&quot;    %s\n&quot;, ippGetString(attr, i, NULL)));
}
</code></pre>
    <p>The <code>ippGetCount</code> function returns the number of values in an attribute.</p>
    <p>The <code>ippGetInteger</code> and <code>ippGetString</code> functions return a single integer or string value from an attribute.</p>
    <p>The <code>ippEnumString</code> function converts a enum value to its keyword (string) equivalent.</p>
    <p>Once you are done using the IPP response message, free it using the <code>ippDelete</code> function:</p>
    <pre><code>ippDelete(response);
</code></pre>
    <h3><a id="authentication">Authentication</a></h3>
    <p>CUPS normally handles authentication through the console. GUI applications should set a password callback using the <code>cupsSetPasswordCB2</code> function:</p>
    <pre><code>void
cupsSetPasswordCB2(cups_password_cb2_t cb, void *user_data);
</code></pre>
    <p>The password callback will be called when needed and is responsible for setting the current user name using <code>cupsSetUser</code> and returning a string:</p>
    <pre><code>const char *
cups_password_cb2(const char *prompt, http_t *http,
                  const char *method, const char *resource,
                  void *user_data);
</code></pre>
    <p>The <code>prompt</code> argument is a string from CUPS that should be displayed to the user.</p>
    <p>The <code>http</code> argument is the connection hosting the request that is being authenticated. The password callback can call the <code>httpGetField</code> and <code>httpGetSubField</code> functions to look for additional details concerning the authentication challenge.</p>
    <p>The <code>method</code> argument specifies the HTTP method used for the request and is typically &quot;POST&quot;.</p>
    <p>The <code>resource</code> argument specifies the path used for the request.</p>
    <p>The <code>user_data</code> argument provides the user data pointer from the <code>cupsSetPasswordCB2</code> call.</p>
      <h2 class="title"><a id="FUNCTIONS">Functions</a></h2>
<h3 class="function"><a id="cupsAddDest">cupsAddDest</a></h3>
        <p class="description">Add a destination to the list of destinations.</p>
<p class="code">
int cupsAddDest(const char *name, const char *instance, int num_dests, <a href="#cups_dest_t">cups_dest_t</a> **dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Destination name</td></tr>
<tr><th>instance</th>
        <td class="description">Instance name or <code>NULL</code> for none/primary</td></tr>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New number of destinations</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function cannot be used to add a new class or printer queue,
it only adds a new container of saved options for the named
destination or instance.<br>
<br>
If the named destination already exists, the destination list is
returned unchanged.  Adding a new instance of a destination creates
a copy of that destination's options.<br>
<br>
Use the <a href="#cupsSaveDests"><code>cupsSaveDests</code></a> function to save the updated list of
destinations to the user's lpoptions file.</p>
<h3 class="function"><span class="info">&#160;CUPS 2.3/macOS 10.14&#160;</span><a id="cupsAddDestMediaOptions">cupsAddDestMediaOptions</a></h3>
        <p class="description">Add the option corresponding to the specified media size.</p>
<p class="code">
int cupsAddDestMediaOptions(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, unsigned flags, <a href="#cups_size_t">cups_size_t</a> *size, int num_options, <a href="#cups_option_t">cups_option_t</a> **options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>flags</th>
        <td class="description">Media matching flags</td></tr>
<tr><th>size</th>
        <td class="description">Media size</td></tr>
<tr><th>num_options</th>
        <td class="description">Current number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New number of options</p>
<h3 class="function"><span class="info">&#160;CUPS 2.2.4/macOS 10.13&#160;</span><a id="cupsAddIntegerOption">cupsAddIntegerOption</a></h3>
        <p class="description">Add an integer option to an option array.</p>
<p class="code">
int cupsAddIntegerOption(const char *name, int value, int num_options, <a href="#cups_option_t">cups_option_t</a> **options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Name of option</td></tr>
<tr><th>value</th>
        <td class="description">Value of option</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Pointer to options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of options</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">New option arrays can be initialized simply by passing 0 for the
&quot;num_options&quot; parameter.

</p>
<h3 class="function"><a id="cupsAddOption">cupsAddOption</a></h3>
        <p class="description">Add an option to an option array.</p>
<p class="code">
int cupsAddOption(const char *name, const char *value, int num_options, <a href="#cups_option_t">cups_option_t</a> **options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Name of option</td></tr>
<tr><th>value</th>
        <td class="description">Value of option</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Pointer to options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of options</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">New option arrays can be initialized simply by passing 0 for the
&quot;num_options&quot; parameter.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCancelDestJob">cupsCancelDestJob</a></h3>
        <p class="description">Cancel a job on a destination.</p>
<p class="code">
ipp_status_t cupsCancelDestJob(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, int job_id);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>job_id</th>
        <td class="description">Job ID</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of cancel operation</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The &quot;job_id&quot; is the number returned by cupsCreateDestJob.<br>
<br>
Returns <code>IPP_STATUS_OK</code> on success and
<code>IPP_STATUS_ERROR_NOT_AUTHORIZED</code> or
<code>IPP_STATUS_ERROR_FORBIDDEN</code> on failure.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCheckDestSupported">cupsCheckDestSupported</a></h3>
        <p class="description">Check that the option and value are supported
by the destination.</p>
<p class="code">
int cupsCheckDestSupported(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *option, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>option</th>
        <td class="description">Option</td></tr>
<tr><th>value</th>
        <td class="description">Value or <code>NULL</code></td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if supported, 0 otherwise</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns 1 if supported, 0 otherwise.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCloseDestJob">cupsCloseDestJob</a></h3>
        <p class="description">Close a job and start printing.</p>
<p class="code">
ipp_status_t cupsCloseDestJob(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *info, int job_id);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>info</th>
        <td class="description">Destination information</td></tr>
<tr><th>job_id</th>
        <td class="description">Job ID</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">IPP status code</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Use when the last call to cupsStartDocument passed 0 for &quot;last_document&quot;.
&quot;job_id&quot; is the job ID returned by cupsCreateDestJob. Returns <code>IPP_STATUS_OK</code>
on success.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsConnectDest">cupsConnectDest</a></h3>
        <p class="description">Open a connection to the destination.</p>
<p class="code">
<a href="#http_t">http_t</a> *cupsConnectDest(<a href="#cups_dest_t">cups_dest_t</a> *dest, unsigned flags, int msec, int *cancel, char *resource, size_t resourcesize, <a href="#cups_dest_cb_t">cups_dest_cb_t</a> cb, void *user_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>flags</th>
        <td class="description">Connection flags</td></tr>
<tr><th>msec</th>
        <td class="description">Timeout in milliseconds</td></tr>
<tr><th>cancel</th>
        <td class="description">Pointer to &quot;cancel&quot; variable</td></tr>
<tr><th>resource</th>
        <td class="description">Resource buffer</td></tr>
<tr><th>resourcesize</th>
        <td class="description">Size of resource buffer</td></tr>
<tr><th>cb</th>
        <td class="description">Callback function</td></tr>
<tr><th>user_data</th>
        <td class="description">User data pointer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Connection to destination or <code>NULL</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Connect to the destination, returning a new <code>http_t</code> connection object
and optionally the resource path to use for the destination.  These calls
will block until a connection is made, the timeout expires, the integer
pointed to by &quot;cancel&quot; is non-zero, or the callback function (or block)
returns 0.  The caller is responsible for calling <a href="#httpClose"><code>httpClose</code></a> on the
returned connection.<br>
<br>
Starting with CUPS 2.2.4, the caller can pass <code>CUPS_DEST_FLAGS_DEVICE</code>
for the &quot;flags&quot; argument to connect directly to the device associated with
the destination.  Otherwise, the connection is made to the CUPS scheduler
associated with the destination.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCopyDest">cupsCopyDest</a></h3>
        <p class="description">Copy a destination.</p>
<p class="code">
int cupsCopyDest(<a href="#cups_dest_t">cups_dest_t</a> *dest, int num_dests, <a href="#cups_dest_t">cups_dest_t</a> **dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>dest</th>
        <td class="description">Destination to copy</td></tr>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destination array</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New number of destinations</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Make a copy of the destination to an array of destinations (or just a single
copy) - for use with the cupsEnumDests* functions. The caller is responsible
for calling cupsFreeDests() on the returned object(s).

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCopyDestConflicts">cupsCopyDestConflicts</a></h3>
        <p class="description">Get conflicts and resolutions for a new
option/value pair.</p>
<p class="code">
int cupsCopyDestConflicts(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, int num_options, <a href="#cups_option_t">cups_option_t</a> *options, const char *new_option, const char *new_value, int *num_conflicts, <a href="#cups_option_t">cups_option_t</a> **conflicts, int *num_resolved, <a href="#cups_option_t">cups_option_t</a> **resolved);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of current options</td></tr>
<tr><th>options</th>
        <td class="description">Current options</td></tr>
<tr><th>new_option</th>
        <td class="description">New option</td></tr>
<tr><th>new_value</th>
        <td class="description">New value</td></tr>
<tr><th>num_conflicts</th>
        <td class="description">Number of conflicting options</td></tr>
<tr><th>conflicts</th>
        <td class="description">Conflicting options</td></tr>
<tr><th>num_resolved</th>
        <td class="description">Number of options to resolve</td></tr>
<tr><th>resolved</th>
        <td class="description">Resolved options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if there is a conflict, 0 if none, -1 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">&quot;num_options&quot; and &quot;options&quot; represent the currently selected options by the
user.  &quot;new_option&quot; and &quot;new_value&quot; are the setting the user has just
changed.<br>
<br>
Returns 1 if there is a conflict, 0 if there are no conflicts, and -1 if
there was an unrecoverable error such as a resolver loop.<br>
<br>
If &quot;num_conflicts&quot; and &quot;conflicts&quot; are not <code>NULL</code>, they are set to
contain the list of conflicting option/value pairs.  Similarly, if
&quot;num_resolved&quot; and &quot;resolved&quot; are not <code>NULL</code> they will be set to the
list of changes needed to resolve the conflict.<br>
<br>
If cupsCopyDestConflicts returns 1 but &quot;num_resolved&quot; and &quot;resolved&quot; are set
to 0 and <code>NULL</code>, respectively, then the conflict cannot be resolved.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCopyDestInfo">cupsCopyDestInfo</a></h3>
        <p class="description">Get the supported values/capabilities for the
destination.</p>
<p class="code">
<a href="#cups_dinfo_t">cups_dinfo_t</a> *cupsCopyDestInfo(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Destination information</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The caller is responsible for calling <a href="#cupsFreeDestInfo"><code>cupsFreeDestInfo</code></a> on the return
value. <code>NULL</code> is returned on error.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsCreateDestJob">cupsCreateDestJob</a></h3>
        <p class="description">Create a job on a destination.</p>
<p class="code">
ipp_status_t cupsCreateDestJob(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *info, int *job_id, const char *title, int num_options, <a href="#cups_option_t">cups_option_t</a> *options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>info</th>
        <td class="description">Destination information</td></tr>
<tr><th>job_id</th>
        <td class="description">Job ID or 0 on error</td></tr>
<tr><th>title</th>
        <td class="description">Job name</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of job options</td></tr>
<tr><th>options</th>
        <td class="description">Job options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">IPP status code</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns <code>IPP_STATUS_OK</code> or <code>IPP_STATUS_OK_SUBST</code> on success, saving the job ID
in the variable pointed to by &quot;job_id&quot;.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.20/macOS 10.4&#160;</span><a id="cupsDoAuthentication">cupsDoAuthentication</a></h3>
        <p class="description">Authenticate a request.</p>
<p class="code">
int cupsDoAuthentication(<a href="#http_t">http_t</a> *http, const char *method, const char *resource);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></td></tr>
<tr><th>method</th>
        <td class="description">Request method (&quot;GET&quot;, &quot;POST&quot;, &quot;PUT&quot;)</td></tr>
<tr><th>resource</th>
        <td class="description">Resource path</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, -1 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function should be called in response to a <code>HTTP_STATUS_UNAUTHORIZED</code>
status, prior to resubmitting your request.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.3/macOS 10.14&#160;</span><a id="cupsEncodeOption">cupsEncodeOption</a></h3>
        <p class="description">Encode a single option into an IPP attribute.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *cupsEncodeOption(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group_tag, const char *name, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP request/response</td></tr>
<tr><th>group_tag</th>
        <td class="description">Attribute group</td></tr>
<tr><th>name</th>
        <td class="description">Option name</td></tr>
<tr><th>value</th>
        <td class="description">Option string value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute or <code>NULL</code> on error</p>
<h3 class="function"><a id="cupsEncodeOptions">cupsEncodeOptions</a></h3>
        <p class="description">Encode printer options into IPP attributes.</p>
<p class="code">
void cupsEncodeOptions(<a href="#ipp_t">ipp_t</a> *ipp, int num_options, <a href="#cups_option_t">cups_option_t</a> *options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP request/response</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function adds operation, job, and then subscription attributes,
in that order. Use the <a href="#cupsEncodeOptions2"><code>cupsEncodeOptions2</code></a> function to add attributes
for a single group.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="cupsEncodeOptions2">cupsEncodeOptions2</a></h3>
        <p class="description">Encode printer options into IPP attributes for a group.</p>
<p class="code">
void cupsEncodeOptions2(<a href="#ipp_t">ipp_t</a> *ipp, int num_options, <a href="#cups_option_t">cups_option_t</a> *options, ipp_tag_t group_tag);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP request/response</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options</td></tr>
<tr><th>group_tag</th>
        <td class="description">Group to encode</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function only adds attributes for a single group. Call this
function multiple times for each group, or use <a href="#cupsEncodeOptions"><code>cupsEncodeOptions</code></a>
to add the standard groups.

</p>
<h3 class="function"><a id="cupsEncryption">cupsEncryption</a></h3>
        <p class="description">Get the current encryption settings.</p>
<p class="code">
<a href="#http_encryption_t">http_encryption_t</a> cupsEncryption(void);</p>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Encryption settings</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The default encryption setting comes from the CUPS_ENCRYPTION
environment variable, then the ~/.cups/client.conf file, and finally the
/etc/cups/client.conf file. If not set, the default is
<code>HTTP_ENCRYPTION_IF_REQUESTED</code>.<br>
<br>
Note: The current encryption setting is tracked separately for each thread
in a program. Multi-threaded programs that override the setting via the
<a href="#cupsSetEncryption"><code>cupsSetEncryption</code></a> function need to do so in each thread for the same
setting to be used.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsEnumDests">cupsEnumDests</a></h3>
        <p class="description">Enumerate available destinations with a callback function.</p>
<p class="code">
int cupsEnumDests(unsigned flags, int msec, int *cancel, <a href="#cups_ptype_t">cups_ptype_t</a> type, <a href="#cups_ptype_t">cups_ptype_t</a> mask, <a href="#cups_dest_cb_t">cups_dest_cb_t</a> cb, void *user_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>flags</th>
        <td class="description">Enumeration flags</td></tr>
<tr><th>msec</th>
        <td class="description">Timeout in milliseconds, -1 for indefinite</td></tr>
<tr><th>cancel</th>
        <td class="description">Pointer to &quot;cancel&quot; variable</td></tr>
<tr><th>type</th>
        <td class="description">Printer type bits</td></tr>
<tr><th>mask</th>
        <td class="description">Mask for printer type bits</td></tr>
<tr><th>cb</th>
        <td class="description">Callback function</td></tr>
<tr><th>user_data</th>
        <td class="description">User data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Destinations are enumerated from one or more sources.  The callback function
receives the <code>user_data</code> pointer and the destination pointer which can
be used as input to the <a href="#cupsCopyDest"><code>cupsCopyDest</code></a> function.  The function must
return 1 to continue enumeration or 0 to stop.<br>
<br>
The <code>type</code> and <code>mask</code> arguments allow the caller to filter the
destinations that are enumerated.  Passing 0 for both will enumerate all
printers.  The constant <code>CUPS_PRINTER_DISCOVERED</code> is used to filter on
destinations that are available but have not yet been added locally.<br>
<br>
Enumeration happens on the current thread and does not return until all
destinations have been enumerated or the callback function returns 0.<br>
<br>
Note: The callback function will likely receive multiple updates for the same
destinations - it is up to the caller to suppress any duplicate destinations.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsFindDestDefault">cupsFindDestDefault</a></h3>
        <p class="description">Find the default value(s) for the given option.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *cupsFindDestDefault(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *option);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>option</th>
        <td class="description">Option/attribute name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Default attribute or <code>NULL</code> for none</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned value is an IPP attribute. Use the <code>ippGetBoolean</code>,
<code>ippGetCollection</code>, <code>ippGetCount</code>, <code>ippGetDate</code>,
<code>ippGetInteger</code>, <code>ippGetOctetString</code>, <code>ippGetRange</code>,
<code>ippGetResolution</code>, <code>ippGetString</code>, and <code>ippGetValueTag</code>
functions to inspect the default value(s) as needed.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsFindDestReady">cupsFindDestReady</a></h3>
        <p class="description">Find the default value(s) for the given option.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *cupsFindDestReady(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *option);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>option</th>
        <td class="description">Option/attribute name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Default attribute or <code>NULL</code> for none</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned value is an IPP attribute. Use the <code>ippGetBoolean</code>,
<code>ippGetCollection</code>, <code>ippGetCount</code>, <code>ippGetDate</code>,
<code>ippGetInteger</code>, <code>ippGetOctetString</code>, <code>ippGetRange</code>,
<code>ippGetResolution</code>, <code>ippGetString</code>, and <code>ippGetValueTag</code>
functions to inspect the default value(s) as needed.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsFindDestSupported">cupsFindDestSupported</a></h3>
        <p class="description">Find the default value(s) for the given option.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *cupsFindDestSupported(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *option);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>option</th>
        <td class="description">Option/attribute name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Default attribute or <code>NULL</code> for none</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned value is an IPP attribute. Use the <code>ippGetBoolean</code>,
<code>ippGetCollection</code>, <code>ippGetCount</code>, <code>ippGetDate</code>,
<code>ippGetInteger</code>, <code>ippGetOctetString</code>, <code>ippGetRange</code>,
<code>ippGetResolution</code>, <code>ippGetString</code>, and <code>ippGetValueTag</code>
functions to inspect the default value(s) as needed.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsFinishDestDocument">cupsFinishDestDocument</a></h3>
        <p class="description">Finish the current document.</p>
<p class="code">
ipp_status_t cupsFinishDestDocument(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *info);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>info</th>
        <td class="description">Destination information</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of document submission</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns <code>IPP_STATUS_OK</code> or <code>IPP_STATUS_OK_SUBST</code> on success.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsFreeDestInfo">cupsFreeDestInfo</a></h3>
        <p class="description">Free destination information obtained using
<a href="#cupsCopyDestInfo"><code>cupsCopyDestInfo</code></a>.</p>
<p class="code">
void cupsFreeDestInfo(<a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
</tbody></table>
<h3 class="function"><a id="cupsFreeDests">cupsFreeDests</a></h3>
        <p class="description">Free the memory used by the list of destinations.</p>
<p class="code">
void cupsFreeDests(int num_dests, <a href="#cups_dest_t">cups_dest_t</a> *dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h3 class="function"><a id="cupsFreeJobs">cupsFreeJobs</a></h3>
        <p class="description">Free memory used by job data.</p>
<p class="code">
void cupsFreeJobs(int num_jobs, <a href="#cups_job_t">cups_job_t</a> *jobs);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>num_jobs</th>
        <td class="description">Number of jobs</td></tr>
<tr><th>jobs</th>
        <td class="description">Jobs</td></tr>
</tbody></table>
<h3 class="function"><a id="cupsFreeOptions">cupsFreeOptions</a></h3>
        <p class="description">Free all memory used by options.</p>
<p class="code">
void cupsFreeOptions(int num_options, <a href="#cups_option_t">cups_option_t</a> *options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Pointer to options</td></tr>
</tbody></table>
<h3 class="function"><a id="cupsGetDest">cupsGetDest</a></h3>
        <p class="description">Get the named destination from the list.</p>
<p class="code">
<a href="#cups_dest_t">cups_dest_t</a> *cupsGetDest(const char *name, const char *instance, int num_dests, <a href="#cups_dest_t">cups_dest_t</a> *dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Destination name or <code>NULL</code> for the default destination</td></tr>
<tr><th>instance</th>
        <td class="description">Instance name or <code>NULL</code></td></tr>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Destination pointer or <code>NULL</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Use the <a href="#cupsEnumDests"><code>cupsEnumDests</code></a> or <a href="#cupsGetDests2"><code>cupsGetDests2</code></a> functions to get a
list of supported destinations for the current user.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsGetDestMediaByIndex">cupsGetDestMediaByIndex</a></h3>
        <p class="description">Get a media name, dimension, and margins for a
specific size.</p>
<p class="code">
int cupsGetDestMediaByIndex(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, int n, unsigned flags, <a href="#cups_size_t">cups_size_t</a> *size);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>n</th>
        <td class="description">Media size number (0-based)</td></tr>
<tr><th>flags</th>
        <td class="description">Media flags</td></tr>
<tr><th>size</th>
        <td class="description">Media size information</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>flags</code> parameter determines which set of media are indexed.  For
example, passing <code>CUPS_MEDIA_FLAGS_BORDERLESS</code> will get the Nth
borderless size supported by the printer.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsGetDestMediaByName">cupsGetDestMediaByName</a></h3>
        <p class="description">Get media names, dimensions, and margins.</p>
<p class="code">
int cupsGetDestMediaByName(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *media, unsigned flags, <a href="#cups_size_t">cups_size_t</a> *size);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>media</th>
        <td class="description">Media name</td></tr>
<tr><th>flags</th>
        <td class="description">Media matching flags</td></tr>
<tr><th>size</th>
        <td class="description">Media size information</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on match, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The &quot;media&quot; string is a PWG media name.  &quot;Flags&quot; provides some matching
guidance (multiple flags can be combined):<br>
<br>
CUPS_MEDIA_FLAGS_DEFAULT    = find the closest size supported by the printer,
CUPS_MEDIA_FLAGS_BORDERLESS = find a borderless size,
CUPS_MEDIA_FLAGS_DUPLEX     = find a size compatible with 2-sided printing,
CUPS_MEDIA_FLAGS_EXACT      = find an exact match for the size, and
CUPS_MEDIA_FLAGS_READY      = if the printer supports media sensing, find the
size amongst the &quot;ready&quot; media.<br>
<br>
The matching result (if any) is returned in the &quot;cups_size_t&quot; structure.<br>
<br>
Returns 1 when there is a match and 0 if there is not a match.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsGetDestMediaBySize">cupsGetDestMediaBySize</a></h3>
        <p class="description">Get media names, dimensions, and margins.</p>
<p class="code">
int cupsGetDestMediaBySize(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, int width, int length, unsigned flags, <a href="#cups_size_t">cups_size_t</a> *size);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>width</th>
        <td class="description">Media width in hundredths of
of millimeters</td></tr>
<tr><th>length</th>
        <td class="description">Media length in hundredths of
of millimeters</td></tr>
<tr><th>flags</th>
        <td class="description">Media matching flags</td></tr>
<tr><th>size</th>
        <td class="description">Media size information</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on match, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">&quot;Width&quot; and &quot;length&quot; are the dimensions in hundredths of millimeters.
&quot;Flags&quot; provides some matching guidance (multiple flags can be combined):<br>
<br>
CUPS_MEDIA_FLAGS_DEFAULT    = find the closest size supported by the printer,
CUPS_MEDIA_FLAGS_BORDERLESS = find a borderless size,
CUPS_MEDIA_FLAGS_DUPLEX     = find a size compatible with 2-sided printing,
CUPS_MEDIA_FLAGS_EXACT      = find an exact match for the size, and
CUPS_MEDIA_FLAGS_READY      = if the printer supports media sensing, find the
size amongst the &quot;ready&quot; media.<br>
<br>
The matching result (if any) is returned in the &quot;cups_size_t&quot; structure.<br>
<br>
Returns 1 when there is a match and 0 if there is not a match.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsGetDestMediaCount">cupsGetDestMediaCount</a></h3>
        <p class="description">Get the number of sizes supported by a
destination.</p>
<p class="code">
int cupsGetDestMediaCount(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, unsigned flags);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>flags</th>
        <td class="description">Media flags</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of sizes</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>flags</code> parameter determines the set of media sizes that are
counted.  For example, passing <code>CUPS_MEDIA_FLAGS_BORDERLESS</code> will return
the number of borderless sizes.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsGetDestMediaDefault">cupsGetDestMediaDefault</a></h3>
        <p class="description">Get the default size for a destination.</p>
<p class="code">
int cupsGetDestMediaDefault(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, unsigned flags, <a href="#cups_size_t">cups_size_t</a> *size);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>flags</th>
        <td class="description">Media flags</td></tr>
<tr><th>size</th>
        <td class="description">Media size information</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>flags</code> parameter determines which default size is returned.  For
example, passing <code>CUPS_MEDIA_FLAGS_BORDERLESS</code> will return the default
borderless size, typically US Letter or A4, but sometimes 4x6 photo media.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="cupsGetDestWithURI">cupsGetDestWithURI</a></h3>
        <p class="description">Get a destination associated with a URI.</p>
<p class="code">
<a href="#cups_dest_t">cups_dest_t</a> *cupsGetDestWithURI(const char *name, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Desired printer name or <code>NULL</code></td></tr>
<tr><th>uri</th>
        <td class="description">URI for the printer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Destination or <code>NULL</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">&quot;name&quot; is the desired name for the printer. If <code>NULL</code>, a name will be
created using the URI.<br>
<br>
&quot;uri&quot; is the &quot;ipp&quot; or &quot;ipps&quot; URI for the printer.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.21/macOS 10.4&#160;</span><a id="cupsGetDests2">cupsGetDests2</a></h3>
        <p class="description">Get the list of destinations from the specified server.</p>
<p class="code">
int cupsGetDests2(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> **dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of destinations</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Starting with CUPS 1.2, the returned list of destinations include the
&quot;printer-info&quot;, &quot;printer-is-accepting-jobs&quot;, &quot;printer-is-shared&quot;,
&quot;printer-make-and-model&quot;, &quot;printer-state&quot;, &quot;printer-state-change-time&quot;,
&quot;printer-state-reasons&quot;, &quot;printer-type&quot;, and &quot;printer-uri-supported&quot;
attributes as options.<br>
<br>
CUPS 1.4 adds the &quot;marker-change-time&quot;, &quot;marker-colors&quot;,
&quot;marker-high-levels&quot;, &quot;marker-levels&quot;, &quot;marker-low-levels&quot;, &quot;marker-message&quot;,
&quot;marker-names&quot;, &quot;marker-types&quot;, and &quot;printer-commands&quot; attributes as options.<br>
<br>
CUPS 2.2 adds accessible IPP printers to the list of destinations that can
be used.  The &quot;printer-uri-supported&quot; option will be present for those IPP
printers that have been recently used.<br>
<br>
Use the <a href="#cupsFreeDests"><code>cupsFreeDests</code></a> function to free the destination list and
the <a href="#cupsGetDest"><code>cupsGetDest</code></a> function to find a particular destination.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.2.4/macOS 10.13&#160;</span><a id="cupsGetIntegerOption">cupsGetIntegerOption</a></h3>
        <p class="description">Get an integer option value.</p>
<p class="code">
int cupsGetIntegerOption(const char *name, int num_options, <a href="#cups_option_t">cups_option_t</a> *options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Name of option</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Option value or <code>INT_MIN</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">INT_MIN is returned when the option does not exist, is not an integer, or
exceeds the range of values for the &quot;int&quot; type.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.21/macOS 10.4&#160;</span><a id="cupsGetJobs2">cupsGetJobs2</a></h3>
        <p class="description">Get the jobs from the specified server.</p>
<p class="code">
int cupsGetJobs2(<a href="#http_t">http_t</a> *http, <a href="#cups_job_t">cups_job_t</a> **jobs, const char *name, int myjobs, int whichjobs);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></td></tr>
<tr><th>jobs</th>
        <td class="description">Job data</td></tr>
<tr><th>name</th>
        <td class="description"><code>NULL</code> = all destinations, otherwise show jobs for named destination</td></tr>
<tr><th>myjobs</th>
        <td class="description">0 = all users, 1 = mine</td></tr>
<tr><th>whichjobs</th>
        <td class="description"><code>CUPS_WHICHJOBS_ALL</code>, <code>CUPS_WHICHJOBS_ACTIVE</code>, or <code>CUPS_WHICHJOBS_COMPLETED</code></td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of jobs</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">A &quot;whichjobs&quot; value of <code>CUPS_WHICHJOBS_ALL</code> returns all jobs regardless
of state, while <code>CUPS_WHICHJOBS_ACTIVE</code> returns jobs that are
pending, processing, or held and <code>CUPS_WHICHJOBS_COMPLETED</code> returns
jobs that are stopped, canceled, aborted, or completed.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span><a id="cupsGetNamedDest">cupsGetNamedDest</a></h3>
        <p class="description">Get options for the named destination.</p>
<p class="code">
<a href="#cups_dest_t">cups_dest_t</a> *cupsGetNamedDest(<a href="#http_t">http_t</a> *http, const char *name, const char *instance);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></td></tr>
<tr><th>name</th>
        <td class="description">Destination name or <code>NULL</code> for the default destination</td></tr>
<tr><th>instance</th>
        <td class="description">Instance name or <code>NULL</code></td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Destination or <code>NULL</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function is optimized for retrieving a single destination and should
be used instead of <a href="#cupsGetDests2"><code>cupsGetDests2</code></a> and <a href="#cupsGetDest"><code>cupsGetDest</code></a> when you
either know the name of the destination or want to print to the default
destination.  If <code>NULL</code> is returned, the destination does not exist or
there is no default destination.<br>
<br>
If &quot;http&quot; is <code>CUPS_HTTP_DEFAULT</code>, the connection to the default print
server will be used.<br>
<br>
If &quot;name&quot; is <code>NULL</code>, the default printer for the current user will be
returned.<br>
<br>
The returned destination must be freed using <a href="#cupsFreeDests"><code>cupsFreeDests</code></a> with a
&quot;num_dests&quot; value of 1.

</p>
<h3 class="function"><a id="cupsGetOption">cupsGetOption</a></h3>
        <p class="description">Get an option value.</p>
<p class="code">
const char *cupsGetOption(const char *name, int num_options, <a href="#cups_option_t">cups_option_t</a> *options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Name of option</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Option value or <code>NULL</code></p>
<h3 class="function"><span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span><a id="cupsGetPassword2">cupsGetPassword2</a></h3>
        <p class="description">Get a password from the user using the current
password callback.</p>
<p class="code">
const char *cupsGetPassword2(const char *prompt, <a href="#http_t">http_t</a> *http, const char *method, const char *resource);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>prompt</th>
        <td class="description">Prompt string</td></tr>
<tr><th>http</th>
        <td class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></td></tr>
<tr><th>method</th>
        <td class="description">Request method (&quot;GET&quot;, &quot;POST&quot;, &quot;PUT&quot;)</td></tr>
<tr><th>resource</th>
        <td class="description">Resource path</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Password</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Uses the current password callback function. Returns <code>NULL</code> if the
user does not provide a password.<br>
<br>
Note: The current password callback function is tracked separately for each
thread in a program. Multi-threaded programs that override the setting via
the <a href="#cupsSetPasswordCB2"><code>cupsSetPasswordCB2</code></a> function need to do so in each thread for the
same function to be used.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="cupsLocalizeDestMedia">cupsLocalizeDestMedia</a></h3>
        <p class="description">Get the localized string for a destination media
size.</p>
<p class="code">
const char *cupsLocalizeDestMedia(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, unsigned flags, <a href="#cups_size_t">cups_size_t</a> *size);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>flags</th>
        <td class="description">Media flags</td></tr>
<tr><th>size</th>
        <td class="description">Media size</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Localized string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned string is stored in the destination information and will become
invalid if the destination information is deleted.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsLocalizeDestOption">cupsLocalizeDestOption</a></h3>
        <p class="description">Get the localized string for a destination
option.</p>
<p class="code">
const char *cupsLocalizeDestOption(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *option);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>option</th>
        <td class="description">Option to localize</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Localized string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned string is stored in the destination information and will become
invalid if the destination information is deleted.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsLocalizeDestValue">cupsLocalizeDestValue</a></h3>
        <p class="description">Get the localized string for a destination
option+value pair.</p>
<p class="code">
const char *cupsLocalizeDestValue(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *dinfo, const char *option, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>dinfo</th>
        <td class="description">Destination information</td></tr>
<tr><th>option</th>
        <td class="description">Option to localize</td></tr>
<tr><th>value</th>
        <td class="description">Value to localize</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Localized string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned string is stored in the destination information and will become
invalid if the destination information is deleted.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="cupsMakeServerCredentials">cupsMakeServerCredentials</a></h3>
        <p class="description">Make a self-signed certificate and private key pair.</p>
<p class="code">
int cupsMakeServerCredentials(const char *path, const char *common_name, int num_alt_names, const char **alt_names, time_t expiration_date);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>path</th>
        <td class="description">Keychain path or <code>NULL</code> for default</td></tr>
<tr><th>common_name</th>
        <td class="description">Common name</td></tr>
<tr><th>num_alt_names</th>
        <td class="description">Number of subject alternate names</td></tr>
<tr><th>alt_names</th>
        <td class="description">Subject Alternate Names</td></tr>
<tr><th>expiration_date</th>
        <td class="description">Expiration date</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h3 class="function"><a id="cupsParseOptions">cupsParseOptions</a></h3>
        <p class="description">Parse options from a command-line argument.</p>
<p class="code">
int cupsParseOptions(const char *arg, int num_options, <a href="#cups_option_t">cups_option_t</a> **options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>arg</th>
        <td class="description">Argument to parse</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options found</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of options found</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function converts space-delimited name/value pairs according
to the PAPI text option ABNF specification. Collection values
(&quot;name={a=... b=... c=...}&quot;) are stored with the curley brackets
intact - use <code>cupsParseOptions</code> on the value to extract the
collection attributes.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.3/macOS 10.5&#160;</span><a id="cupsRemoveDest">cupsRemoveDest</a></h3>
        <p class="description">Remove a destination from the destination list.</p>
<p class="code">
int cupsRemoveDest(const char *name, const char *instance, int num_dests, <a href="#cups_dest_t">cups_dest_t</a> **dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Destination name</td></tr>
<tr><th>instance</th>
        <td class="description">Instance name or <code>NULL</code></td></tr>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New number of destinations</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Removing a destination/instance does not delete the class or printer
queue, merely the lpoptions for that destination/instance.  Use the
<a href="#cupsSetDests"><code>cupsSetDests</code></a> or <a href="#cupsSetDests2"><code>cupsSetDests2</code></a> functions to save the new
options for the user.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="cupsRemoveOption">cupsRemoveOption</a></h3>
        <p class="description">Remove an option from an option array.</p>
<p class="code">
int cupsRemoveOption(const char *name, int num_options, <a href="#cups_option_t">cups_option_t</a> **options);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Option name</td></tr>
<tr><th>num_options</th>
        <td class="description">Current number of options</td></tr>
<tr><th>options</th>
        <td class="description">Options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New number of options</p>
<h3 class="function"><a id="cupsServer">cupsServer</a></h3>
        <p class="description">Return the hostname/address of the current server.</p>
<p class="code">
const char *cupsServer(void);</p>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Server name</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The default server comes from the CUPS_SERVER environment variable, then the
~/.cups/client.conf file, and finally the /etc/cups/client.conf file. If not
set, the default is the local system - either &quot;localhost&quot; or a domain socket
path.<br>
<br>
The returned value can be a fully-qualified hostname, a numeric IPv4 or IPv6
address, or a domain socket pathname.<br>
<br>
Note: The current server is tracked separately for each thread in a program.
Multi-threaded programs that override the server via the
<a href="#cupsSetServer"><code>cupsSetServer</code></a> function need to do so in each thread for the same
server to be used.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="cupsSetClientCertCB">cupsSetClientCertCB</a></h3>
        <p class="description">Set the client certificate callback.</p>
<p class="code">
void cupsSetClientCertCB(<a href="#cups_client_cert_cb_t">cups_client_cert_cb_t</a> cb, void *user_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>cb</th>
        <td class="description">Callback function</td></tr>
<tr><th>user_data</th>
        <td class="description">User data pointer</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Pass <code>NULL</code> to restore the default callback.<br>
<br>
Note: The current certificate callback is tracked separately for each thread
in a program. Multi-threaded programs that override the callback need to do
so in each thread for the same callback to be used.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="cupsSetCredentials">cupsSetCredentials</a></h3>
        <p class="description">Set the default credentials to be used for SSL/TLS
connections.</p>
<p class="code">
int cupsSetCredentials(cups_array_t *credentials);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Array of credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Note: The default credentials are tracked separately for each thread in a
program. Multi-threaded programs that override the setting need to do so in
each thread for the same setting to be used.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.3/macOS 10.5&#160;</span><a id="cupsSetDefaultDest">cupsSetDefaultDest</a></h3>
        <p class="description">Set the default destination.</p>
<p class="code">
void cupsSetDefaultDest(const char *name, const char *instance, int num_dests, <a href="#cups_dest_t">cups_dest_t</a> *dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Destination name</td></tr>
<tr><th>instance</th>
        <td class="description">Instance name or <code>NULL</code></td></tr>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.1.21/macOS 10.4&#160;</span><a id="cupsSetDests2">cupsSetDests2</a></h3>
        <p class="description">Save the list of destinations for the specified server.</p>
<p class="code">
int cupsSetDests2(<a href="#http_t">http_t</a> *http, int num_dests, <a href="#cups_dest_t">cups_dest_t</a> *dests);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to server or <code>CUPS_HTTP_DEFAULT</code></td></tr>
<tr><th>num_dests</th>
        <td class="description">Number of destinations</td></tr>
<tr><th>dests</th>
        <td class="description">Destinations</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, -1 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function saves the destinations to /etc/cups/lpoptions when run
as root and ~/.cups/lpoptions when run as a normal user.

</p>
<h3 class="function"><a id="cupsSetEncryption">cupsSetEncryption</a></h3>
        <p class="description">Set the encryption preference.</p>
<p class="code">
void cupsSetEncryption(<a href="#http_encryption_t">http_encryption_t</a> e);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>e</th>
        <td class="description">New encryption preference</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The default encryption setting comes from the CUPS_ENCRYPTION
environment variable, then the ~/.cups/client.conf file, and finally the
/etc/cups/client.conf file. If not set, the default is
<code>HTTP_ENCRYPTION_IF_REQUESTED</code>.<br>
<br>
Note: The current encryption setting is tracked separately for each thread
in a program. Multi-threaded programs that override the setting need to do
so in each thread for the same setting to be used.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span><a id="cupsSetPasswordCB2">cupsSetPasswordCB2</a></h3>
        <p class="description">Set the advanced password callback for CUPS.</p>
<p class="code">
void cupsSetPasswordCB2(<a href="#cups_password_cb2_t">cups_password_cb2_t</a> cb, void *user_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>cb</th>
        <td class="description">Callback function</td></tr>
<tr><th>user_data</th>
        <td class="description">User data pointer</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Pass <code>NULL</code> to restore the default (console) password callback, which
reads the password from the console. Programs should call either this
function or <a href="#cupsSetPasswordCB2"><code>cupsSetPasswordCB2</code></a>, as only one callback can be registered
by a program per thread.<br>
<br>
Note: The current password callback is tracked separately for each thread
in a program. Multi-threaded programs that override the callback need to do
so in each thread for the same callback to be used.

</p>
<h3 class="function"><a id="cupsSetServer">cupsSetServer</a></h3>
        <p class="description">Set the default server name and port.</p>
<p class="code">
void cupsSetServer(const char *server);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>server</th>
        <td class="description">Server name</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The &quot;server&quot; string can be a fully-qualified hostname, a numeric
IPv4 or IPv6 address, or a domain socket pathname. Hostnames and numeric IP
addresses can be optionally followed by a colon and port number to override
the default port 631, e.g. &quot;hostname:8631&quot;. Pass <code>NULL</code> to restore the
default server name and port.<br>
<br>
Note: The current server is tracked separately for each thread in a program.
Multi-threaded programs that override the server need to do so in each
thread for the same server to be used.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="cupsSetServerCertCB">cupsSetServerCertCB</a></h3>
        <p class="description">Set the server certificate callback.</p>
<p class="code">
void cupsSetServerCertCB(<a href="#cups_server_cert_cb_t">cups_server_cert_cb_t</a> cb, void *user_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>cb</th>
        <td class="description">Callback function</td></tr>
<tr><th>user_data</th>
        <td class="description">User data pointer</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Pass <code>NULL</code> to restore the default callback.<br>
<br>
Note: The current credentials callback is tracked separately for each thread
in a program. Multi-threaded programs that override the callback need to do
so in each thread for the same callback to be used.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="cupsSetServerCredentials">cupsSetServerCredentials</a></h3>
        <p class="description">Set the default server credentials.</p>
<p class="code">
int cupsSetServerCredentials(const char *path, const char *common_name, int auto_create);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>path</th>
        <td class="description">Keychain path or <code>NULL</code> for default</td></tr>
<tr><th>common_name</th>
        <td class="description">Default common name for server</td></tr>
<tr><th>auto_create</th>
        <td class="description">1 = automatically create self-signed certificates</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Note: The server credentials are used by all threads in the running process.
This function is threadsafe.

</p>
<h3 class="function"><a id="cupsSetUser">cupsSetUser</a></h3>
        <p class="description">Set the default user name.</p>
<p class="code">
void cupsSetUser(const char *user);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>user</th>
        <td class="description">User name</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Pass <code>NULL</code> to restore the default user name.<br>
<br>
Note: The current user name is tracked separately for each thread in a
program. Multi-threaded programs that override the user name need to do so
in each thread for the same user name to be used.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsSetUserAgent">cupsSetUserAgent</a></h3>
        <p class="description">Set the default HTTP User-Agent string.</p>
<p class="code">
void cupsSetUserAgent(const char *user_agent);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>user_agent</th>
        <td class="description">User-Agent string or <code>NULL</code></td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Setting the string to NULL forces the default value containing the CUPS
version, IPP version, and operating system version and architecture.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cupsStartDestDocument">cupsStartDestDocument</a></h3>
        <p class="description">Start a new document.</p>
<p class="code">
http_status_t cupsStartDestDocument(<a href="#http_t">http_t</a> *http, <a href="#cups_dest_t">cups_dest_t</a> *dest, <a href="#cups_dinfo_t">cups_dinfo_t</a> *info, int job_id, const char *docname, const char *format, int num_options, <a href="#cups_option_t">cups_option_t</a> *options, int last_document);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to destination</td></tr>
<tr><th>dest</th>
        <td class="description">Destination</td></tr>
<tr><th>info</th>
        <td class="description">Destination information</td></tr>
<tr><th>job_id</th>
        <td class="description">Job ID</td></tr>
<tr><th>docname</th>
        <td class="description">Document name</td></tr>
<tr><th>format</th>
        <td class="description">Document format</td></tr>
<tr><th>num_options</th>
        <td class="description">Number of document options</td></tr>
<tr><th>options</th>
        <td class="description">Document options</td></tr>
<tr><th>last_document</th>
        <td class="description">1 if this is the last document</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of document creation</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">&quot;job_id&quot; is the job ID returned by cupsCreateDestJob.  &quot;docname&quot; is the name
of the document/file being printed, &quot;format&quot; is the MIME media type for the
document (see CUPS_FORMAT_xxx constants), and &quot;num_options&quot; and &quot;options&quot;
are the options do be applied to the document. &quot;last_document&quot; should be 1
if this is the last document to be submitted in the job.  Returns
<code>HTTP_CONTINUE</code> on success.

</p>
<h3 class="function"><a id="cupsUser">cupsUser</a></h3>
        <p class="description">Return the current user's name.</p>
<p class="code">
const char *cupsUser(void);</p>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">User name</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Note: The current user name is tracked separately for each thread in a
program. Multi-threaded programs that override the user name with the
<a href="#cupsSetUser"><code>cupsSetUser</code></a> function need to do so in each thread for the same user
name to be used.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="cupsUserAgent">cupsUserAgent</a></h3>
        <p class="description">Return the default HTTP User-Agent string.</p>
<p class="code">
const char *cupsUserAgent(void);</p>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">User-Agent string</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpAcceptConnection">httpAcceptConnection</a></h3>
        <p class="description">Accept a new HTTP client connection from the
specified listening socket.</p>
<p class="code">
<a href="#http_t">http_t</a> *httpAcceptConnection(int fd, int blocking);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>fd</th>
        <td class="description">Listen socket file descriptor</td></tr>
<tr><th>blocking</th>
        <td class="description">1 if the connection should be
blocking, 0 otherwise</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">HTTP connection or <code>NULL</code></p>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="httpAddCredential">httpAddCredential</a></h3>
        <p class="description">Allocates and adds a single credential to an array.</p>
<p class="code">
int httpAddCredential(cups_array_t *credentials, const void *data, size_t datalen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Credentials array</td></tr>
<tr><th>data</th>
        <td class="description">PEM-encoded X.509 data</td></tr>
<tr><th>datalen</th>
        <td class="description">Length of data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, -1 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Use <code>cupsArrayNew(NULL, NULL)</code> to create a credentials array.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrAny">httpAddrAny</a></h3>
        <p class="description">Check for the &quot;any&quot; address.</p>
<p class="code">
int httpAddrAny(const <a href="#http_addr_t">http_addr_t</a> *addr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address to check</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if &quot;any&quot;, 0 otherwise</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpAddrClose">httpAddrClose</a></h3>
        <p class="description">Close a socket created by <a href="#httpAddrConnect"><code>httpAddrConnect</code></a> or
<a href="#httpAddrListen"><code>httpAddrListen</code></a>.</p>
<p class="code">
int httpAddrClose(<a href="#http_addr_t">http_addr_t</a> *addr, int fd);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Listen address or <code>NULL</code></td></tr>
<tr><th>fd</th>
        <td class="description">Socket file descriptor</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, -1 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Pass <code>NULL</code> for sockets created with <a href="#httpAddrConnect2"><code>httpAddrConnect2</code></a> and the
listen address for sockets created with <a href="#httpAddrListen"><code>httpAddrListen</code></a>.  This function
ensures that domain sockets are removed when closed.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpAddrConnect2">httpAddrConnect2</a></h3>
        <p class="description">Connect to any of the addresses in the list with a
timeout and optional cancel.</p>
<p class="code">
<a href="#http_addrlist_t">http_addrlist_t</a> *httpAddrConnect2(<a href="#http_addrlist_t">http_addrlist_t</a> *addrlist, int *sock, int msec, int *cancel);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addrlist</th>
        <td class="description">List of potential addresses</td></tr>
<tr><th>sock</th>
        <td class="description">Socket</td></tr>
<tr><th>msec</th>
        <td class="description">Timeout in milliseconds</td></tr>
<tr><th>cancel</th>
        <td class="description">Pointer to &quot;cancel&quot; variable</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Connected address or NULL on failure</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpAddrCopyList">httpAddrCopyList</a></h3>
        <p class="description">Copy an address list.</p>
<p class="code">
<a href="#http_addrlist_t">http_addrlist_t</a> *httpAddrCopyList(<a href="#http_addrlist_t">http_addrlist_t</a> *src);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>src</th>
        <td class="description">Source address list</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New address list or <code>NULL</code> on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrEqual">httpAddrEqual</a></h3>
        <p class="description">Compare two addresses.</p>
<p class="code">
int httpAddrEqual(const <a href="#http_addr_t">http_addr_t</a> *addr1, const <a href="#http_addr_t">http_addr_t</a> *addr2);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr1</th>
        <td class="description">First address</td></tr>
<tr><th>addr2</th>
        <td class="description">Second address</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if equal, 0 if not</p>
<h3 class="function"><a id="httpAddrFamily">httpAddrFamily</a></h3>
        <p class="description">Get the address family of an address.</p>
<p class="code">
int httpAddrFamily(<a href="#http_addr_t">http_addr_t</a> *addr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Address family</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrFreeList">httpAddrFreeList</a></h3>
        <p class="description">Free an address list.</p>
<p class="code">
void httpAddrFreeList(<a href="#http_addrlist_t">http_addrlist_t</a> *addrlist);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addrlist</th>
        <td class="description">Address list to free</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrGetList">httpAddrGetList</a></h3>
        <p class="description">Get a list of addresses for a hostname.</p>
<p class="code">
<a href="#http_addrlist_t">http_addrlist_t</a> *httpAddrGetList(const char *hostname, int family, const char *service);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>hostname</th>
        <td class="description">Hostname, IP address, or NULL for passive listen address</td></tr>
<tr><th>family</th>
        <td class="description">Address family or AF_UNSPEC</td></tr>
<tr><th>service</th>
        <td class="description">Service name or port number</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">List of addresses or NULL</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrLength">httpAddrLength</a></h3>
        <p class="description">Return the length of the address in bytes.</p>
<p class="code">
int httpAddrLength(const <a href="#http_addr_t">http_addr_t</a> *addr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Length in bytes</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpAddrListen">httpAddrListen</a></h3>
        <p class="description">Create a listening socket bound to the specified
address and port.</p>
<p class="code">
int httpAddrListen(<a href="#http_addr_t">http_addr_t</a> *addr, int port);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address to bind to</td></tr>
<tr><th>port</th>
        <td class="description">Port number to bind to</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Socket or -1 on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrLocalhost">httpAddrLocalhost</a></h3>
        <p class="description">Check for the local loopback address.</p>
<p class="code">
int httpAddrLocalhost(const <a href="#http_addr_t">http_addr_t</a> *addr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address to check</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if local host, 0 otherwise</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrLookup">httpAddrLookup</a></h3>
        <p class="description">Lookup the hostname associated with the address.</p>
<p class="code">
char *httpAddrLookup(const <a href="#http_addr_t">http_addr_t</a> *addr, char *name, int namelen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address to lookup</td></tr>
<tr><th>name</th>
        <td class="description">Host name buffer</td></tr>
<tr><th>namelen</th>
        <td class="description">Size of name buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Host name</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpAddrPort">httpAddrPort</a></h3>
        <p class="description">Get the port number associated with an address.</p>
<p class="code">
int httpAddrPort(<a href="#http_addr_t">http_addr_t</a> *addr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Port number</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAddrString">httpAddrString</a></h3>
        <p class="description">Convert an address to a numeric string.</p>
<p class="code">
char *httpAddrString(const <a href="#http_addr_t">http_addr_t</a> *addr, char *s, int slen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>addr</th>
        <td class="description">Address to convert</td></tr>
<tr><th>s</th>
        <td class="description">String buffer</td></tr>
<tr><th>slen</th>
        <td class="description">Length of string</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Numeric address string</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAssembleURI">httpAssembleURI</a></h3>
        <p class="description">Assemble a uniform resource identifier from its
components.</p>
<p class="code">
<a href="#http_uri_status_t">http_uri_status_t</a> httpAssembleURI(<a href="#http_uri_coding_t">http_uri_coding_t</a> encoding, char *uri, int urilen, const char *scheme, const char *username, const char *host, int port, const char *resource);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>encoding</th>
        <td class="description">Encoding flags</td></tr>
<tr><th>uri</th>
        <td class="description">URI buffer</td></tr>
<tr><th>urilen</th>
        <td class="description">Size of URI buffer</td></tr>
<tr><th>scheme</th>
        <td class="description">Scheme name</td></tr>
<tr><th>username</th>
        <td class="description">Username</td></tr>
<tr><th>host</th>
        <td class="description">Hostname or address</td></tr>
<tr><th>port</th>
        <td class="description">Port number</td></tr>
<tr><th>resource</th>
        <td class="description">Resource</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">URI status</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function escapes reserved characters in the URI depending on the
value of the &quot;encoding&quot; argument.  You should use this function in
place of traditional string functions whenever you need to create a
URI string.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpAssembleURIf">httpAssembleURIf</a></h3>
        <p class="description">Assemble a uniform resource identifier from its
components with a formatted resource.</p>
<p class="code">
<a href="#http_uri_status_t">http_uri_status_t</a> httpAssembleURIf(<a href="#http_uri_coding_t">http_uri_coding_t</a> encoding, char *uri, int urilen, const char *scheme, const char *username, const char *host, int port, const char *resourcef, ...);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>encoding</th>
        <td class="description">Encoding flags</td></tr>
<tr><th>uri</th>
        <td class="description">URI buffer</td></tr>
<tr><th>urilen</th>
        <td class="description">Size of URI buffer</td></tr>
<tr><th>scheme</th>
        <td class="description">Scheme name</td></tr>
<tr><th>username</th>
        <td class="description">Username</td></tr>
<tr><th>host</th>
        <td class="description">Hostname or address</td></tr>
<tr><th>port</th>
        <td class="description">Port number</td></tr>
<tr><th>resourcef</th>
        <td class="description">Printf-style resource</td></tr>
<tr><th>...</th>
        <td class="description">Additional arguments as needed</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">URI status</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function creates a formatted version of the resource string
argument &quot;resourcef&quot; and escapes reserved characters in the URI
depending on the value of the &quot;encoding&quot; argument.  You should use
this function in place of traditional string functions whenever
you need to create a URI string.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpAssembleUUID">httpAssembleUUID</a></h3>
        <p class="description">Assemble a name-based UUID URN conforming to RFC 4122.</p>
<p class="code">
char *httpAssembleUUID(const char *server, int port, const char *name, int number, char *buffer, size_t bufsize);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>server</th>
        <td class="description">Server name</td></tr>
<tr><th>port</th>
        <td class="description">Port number</td></tr>
<tr><th>name</th>
        <td class="description">Object name or NULL</td></tr>
<tr><th>number</th>
        <td class="description">Object number or 0</td></tr>
<tr><th>buffer</th>
        <td class="description">String buffer</td></tr>
<tr><th>bufsize</th>
        <td class="description">Size of buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">UUID string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function creates a unique 128-bit identifying number using the server
name, port number, random data, and optionally an object name and/or object
number.  The result is formatted as a UUID URN as defined in RFC 4122.<br>
<br>
The buffer needs to be at least 46 bytes in size.

</p>
<h3 class="function"><a id="httpBlocking">httpBlocking</a></h3>
        <p class="description">Set blocking/non-blocking behavior on a connection.</p>
<p class="code">
void httpBlocking(<a href="#http_t">http_t</a> *http, int b);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>b</th>
        <td class="description">1 = blocking, 0 = non-blocking</td></tr>
</tbody></table>
<h3 class="function"><a id="httpCheck">httpCheck</a></h3>
        <p class="description">Check to see if there is a pending response from the server.</p>
<p class="code">
int httpCheck(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 = no data, 1 = data available</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="httpClearCookie">httpClearCookie</a></h3>
        <p class="description">Clear the cookie value(s).</p>
<p class="code">
void httpClearCookie(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h3 class="function"><a id="httpClearFields">httpClearFields</a></h3>
        <p class="description">Clear HTTP request fields.</p>
<p class="code">
void httpClearFields(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h3 class="function"><a id="httpClose">httpClose</a></h3>
        <p class="description">Close an HTTP connection.</p>
<p class="code">
void httpClose(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpCompareCredentials">httpCompareCredentials</a></h3>
        <p class="description">Compare two sets of X.509 credentials.</p>
<p class="code">
int httpCompareCredentials(cups_array_t *cred1, cups_array_t *cred2);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>cred1</th>
        <td class="description">First set of X.509 credentials</td></tr>
<tr><th>cred2</th>
        <td class="description">Second set of X.509 credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if they match, 0 if they do not</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpConnect2">httpConnect2</a></h3>
        <p class="description">Connect to a HTTP server.</p>
<p class="code">
<a href="#http_t">http_t</a> *httpConnect2(const char *host, int port, <a href="#http_addrlist_t">http_addrlist_t</a> *addrlist, int family, <a href="#http_encryption_t">http_encryption_t</a> encryption, int blocking, int msec, int *cancel);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>host</th>
        <td class="description">Host to connect to</td></tr>
<tr><th>port</th>
        <td class="description">Port number</td></tr>
<tr><th>addrlist</th>
        <td class="description">List of addresses or <code>NULL</code> to lookup</td></tr>
<tr><th>family</th>
        <td class="description">Address family to use or <code>AF_UNSPEC</code> for any</td></tr>
<tr><th>encryption</th>
        <td class="description">Type of encryption to use</td></tr>
<tr><th>blocking</th>
        <td class="description">1 for blocking connection, 0 for non-blocking</td></tr>
<tr><th>msec</th>
        <td class="description">Connection timeout in milliseconds, 0 means don't connect</td></tr>
<tr><th>cancel</th>
        <td class="description">Pointer to &quot;cancel&quot; variable</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New HTTP connection</p>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="httpCopyCredentials">httpCopyCredentials</a></h3>
        <p class="description">Copy the credentials associated with the peer in
an encrypted connection.</p>
<p class="code">
int httpCopyCredentials(<a href="#http_t">http_t</a> *http, cups_array_t **credentials);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection to server</td></tr>
<tr><th>credentials</th>
        <td class="description">Array of credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="httpCredentialsAreValidForName">httpCredentialsAreValidForName</a></h3>
        <p class="description">Return whether the credentials are valid for the given name.</p>
<p class="code">
int httpCredentialsAreValidForName(cups_array_t *credentials, const char *common_name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Credentials</td></tr>
<tr><th>common_name</th>
        <td class="description">Name to check</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if valid, 0 otherwise</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="httpCredentialsGetExpiration">httpCredentialsGetExpiration</a></h3>
        <p class="description">Return the expiration date of the credentials.</p>
<p class="code">
time_t httpCredentialsGetExpiration(cups_array_t *credentials);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Expiration date of credentials</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="httpCredentialsGetTrust">httpCredentialsGetTrust</a></h3>
        <p class="description">Return the trust of credentials.</p>
<p class="code">
<a href="#http_trust_t">http_trust_t</a> httpCredentialsGetTrust(cups_array_t *credentials, const char *common_name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Credentials</td></tr>
<tr><th>common_name</th>
        <td class="description">Common name for trust lookup</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Level of trust</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/macOS 10.10&#160;</span><a id="httpCredentialsString">httpCredentialsString</a></h3>
        <p class="description">Return a string representing the credentials.</p>
<p class="code">
size_t httpCredentialsString(cups_array_t *credentials, char *buffer, size_t bufsize);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Credentials</td></tr>
<tr><th>buffer</th>
        <td class="description">Buffer or <code>NULL</code></td></tr>
<tr><th>bufsize</th>
        <td class="description">Size of buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Total size of credentials string</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.21/macOS 10.4&#160;</span><a id="httpDecode64_2">httpDecode64_2</a></h3>
        <p class="description">Base64-decode a string.</p>
<p class="code">
char *httpDecode64_2(char *out, int *outlen, const char *in);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>out</th>
        <td class="description">String to write to</td></tr>
<tr><th>outlen</th>
        <td class="description">Size of output string</td></tr>
<tr><th>in</th>
        <td class="description">String to read from</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Decoded string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The caller must initialize &quot;outlen&quot; to the maximum size of the decoded
string before calling <code>httpDecode64_2</code>.  On return &quot;outlen&quot; contains the
decoded length of the string.

</p>
<h3 class="function"><a id="httpDelete">httpDelete</a></h3>
        <p class="description">Send a DELETE request to the server.</p>
<p class="code">
int httpDelete(<a href="#http_t">http_t</a> *http, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI to delete</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.21/macOS 10.4&#160;</span><a id="httpEncode64_2">httpEncode64_2</a></h3>
        <p class="description">Base64-encode a string.</p>
<p class="code">
char *httpEncode64_2(char *out, int outlen, const char *in, int inlen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>out</th>
        <td class="description">String to write to</td></tr>
<tr><th>outlen</th>
        <td class="description">Maximum size of output string</td></tr>
<tr><th>in</th>
        <td class="description">String to read from</td></tr>
<tr><th>inlen</th>
        <td class="description">Size of input string</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Encoded string</p>
<h3 class="function"><a id="httpEncryption">httpEncryption</a></h3>
        <p class="description">Set the required encryption on the link.</p>
<p class="code">
int httpEncryption(<a href="#http_t">http_t</a> *http, <a href="#http_encryption_t">http_encryption_t</a> e);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>e</th>
        <td class="description">New encryption preference</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">-1 on error, 0 on success</p>
<h3 class="function"><a id="httpError">httpError</a></h3>
        <p class="description">Get the last error on a connection.</p>
<p class="code">
int httpError(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Error code (errno) value</p>
<h3 class="function"><a id="httpFieldValue">httpFieldValue</a></h3>
        <p class="description">Return the HTTP field enumeration value for a field
name.</p>
<p class="code">
<a href="#http_field_t">http_field_t</a> httpFieldValue(const char *name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">String name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Field index</p>
<h3 class="function"><a id="httpFlush">httpFlush</a></h3>
        <p class="description">Flush data read from a HTTP connection.</p>
<p class="code">
void httpFlush(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpFlushWrite">httpFlushWrite</a></h3>
        <p class="description">Flush data written to a HTTP connection.</p>
<p class="code">
int httpFlushWrite(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Bytes written or -1 on error</p>
<h3 class="function"><a id="httpFreeCredentials">httpFreeCredentials</a></h3>
        <p class="description">Free an array of credentials.</p>
<p class="code">
void httpFreeCredentials(cups_array_t *credentials);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>credentials</th>
        <td class="description">Array of credentials</td></tr>
</tbody></table>
<h3 class="function"><a id="httpGet">httpGet</a></h3>
        <p class="description">Send a GET request to the server.</p>
<p class="code">
int httpGet(<a href="#http_t">http_t</a> *http, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI to get</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetActivity">httpGetActivity</a></h3>
        <p class="description">Get the most recent activity for a connection.</p>
<p class="code">
time_t httpGetActivity(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Time of last read or write</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The return value is the time in seconds of the last read or write.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetAddress">httpGetAddress</a></h3>
        <p class="description">Get the address of the connected peer of a connection.</p>
<p class="code">
<a href="#http_addr_t">http_addr_t</a> *httpGetAddress(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Connected address or <code>NULL</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">For connections created with <a href="#httpConnect2"><code>httpConnect2</code></a>, the address is for the
server.  For connections created with <a href="#httpAccept"><code>httpAccept</code></a>, the address is for
the client.<br>
<br>
Returns <code>NULL</code> if the socket is currently unconnected.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.3/macOS 10.5&#160;</span><a id="httpGetAuthString">httpGetAuthString</a></h3>
        <p class="description">Get the current authorization string.</p>
<p class="code">
char *httpGetAuthString(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Authorization string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The authorization string is set by <a href="#cupsDoAuthentication"><code>cupsDoAuthentication</code></a> and
<a href="#httpSetAuthString"><code>httpSetAuthString</code></a>.  Use <a href="#httpGetAuthString"><code>httpGetAuthString</code></a> to retrieve the
string to use with <a href="#httpSetField"><code>httpSetField</code></a> for the
<code>HTTP_FIELD_AUTHORIZATION</code> value.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetBlocking">httpGetBlocking</a></h3>
        <p class="description">Get the blocking/non-block state of a connection.</p>
<p class="code">
int httpGetBlocking(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if blocking, 0 if non-blocking</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpGetContentEncoding">httpGetContentEncoding</a></h3>
        <p class="description">Get a common content encoding, if any, between
the client and server.</p>
<p class="code">
const char *httpGetContentEncoding(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Content-Coding value or
<code>NULL</code> for the identity
coding.</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function uses the value of the Accepts-Encoding HTTP header and must be
called after receiving a response from the server or a request from the
client.  The value returned can be use in subsequent requests (for clients)
or in the response (for servers) in order to compress the content stream.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="httpGetCookie">httpGetCookie</a></h3>
        <p class="description">Get any cookie data from the response.</p>
<p class="code">
const char *httpGetCookie(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Cookie data or <code>NULL</code></p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetDateString2">httpGetDateString2</a></h3>
        <p class="description">Get a formatted date/time string from a time value.</p>
<p class="code">
const char *httpGetDateString2(time_t t, char *s, int slen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>t</th>
        <td class="description">Time in seconds</td></tr>
<tr><th>s</th>
        <td class="description">String buffer</td></tr>
<tr><th>slen</th>
        <td class="description">Size of string buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Date/time string</p>
<h3 class="function"><a id="httpGetDateTime">httpGetDateTime</a></h3>
        <p class="description">Get a time value from a formatted date/time string.</p>
<p class="code">
time_t httpGetDateTime(const char *s);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>s</th>
        <td class="description">Date/time string</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Time in seconds</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetEncryption">httpGetEncryption</a></h3>
        <p class="description">Get the current encryption mode of a connection.</p>
<p class="code">
<a href="#http_encryption_t">http_encryption_t</a> httpGetEncryption(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current encryption mode</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function returns the encryption mode for the connection. Use the
<a href="#httpIsEncrypted"><code>httpIsEncrypted</code></a> function to determine whether a TLS session has
been established.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpGetExpect">httpGetExpect</a></h3>
        <p class="description">Get the value of the Expect header, if any.</p>
<p class="code">
http_status_t httpGetExpect(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Expect: status, if any</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns <code>HTTP_STATUS_NONE</code> if there is no Expect header, otherwise
returns the expected HTTP status code, typically <code>HTTP_STATUS_CONTINUE</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetFd">httpGetFd</a></h3>
        <p class="description">Get the file descriptor associated with a connection.</p>
<p class="code">
int httpGetFd(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">File descriptor or -1 if none</p>
<h3 class="function"><a id="httpGetField">httpGetField</a></h3>
        <p class="description">Get a field value from a request/response.</p>
<p class="code">
const char *httpGetField(<a href="#http_t">http_t</a> *http, <a href="#http_field_t">http_field_t</a> field);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>field</th>
        <td class="description">Field to get</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Field value</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetHostname">httpGetHostname</a></h3>
        <p class="description">Get the FQDN for the connection or local system.</p>
<p class="code">
const char *httpGetHostname(<a href="#http_t">http_t</a> *http, char *s, int slen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection or NULL</td></tr>
<tr><th>s</th>
        <td class="description">String buffer for name</td></tr>
<tr><th>slen</th>
        <td class="description">Size of buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">FQDN for connection or system</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">When &quot;http&quot; points to a connected socket, return the hostname or
address that was used in the call to httpConnect() or httpConnectEncrypt(),
or the address of the client for the connection from httpAcceptConnection().
Otherwise, return the FQDN for the local system using both gethostname()
and gethostbyname() to get the local hostname with domain.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetKeepAlive">httpGetKeepAlive</a></h3>
        <p class="description">Get the current Keep-Alive state of the connection.</p>
<p class="code">
<a href="#http_keepalive_t">http_keepalive_t</a> httpGetKeepAlive(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Keep-Alive state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetLength2">httpGetLength2</a></h3>
        <p class="description">Get the amount of data remaining from the
content-length or transfer-encoding fields.</p>
<p class="code">
off_t httpGetLength2(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Content length</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function returns the complete content length, even for
content larger than 2^31 - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetPending">httpGetPending</a></h3>
        <p class="description">Get the number of bytes that are buffered for writing.</p>
<p class="code">
size_t httpGetPending(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of bytes buffered</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetReady">httpGetReady</a></h3>
        <p class="description">Get the number of bytes that can be read without blocking.</p>
<p class="code">
size_t httpGetReady(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of bytes available</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpGetRemaining">httpGetRemaining</a></h3>
        <p class="description">Get the number of remaining bytes in the message
body or current chunk.</p>
<p class="code">
size_t httpGetRemaining(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Remaining bytes</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <a href="#httpIsChunked"><code>httpIsChunked</code></a> function can be used to determine whether the
message body is chunked or fixed-length.

</p>
<h3 class="function"><a id="httpGetState">httpGetState</a></h3>
        <p class="description">Get the current state of the HTTP request.</p>
<p class="code">
<a href="#http_state_t">http_state_t</a> httpGetState(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">HTTP state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetStatus">httpGetStatus</a></h3>
        <p class="description">Get the status of the last HTTP request.</p>
<p class="code">
http_status_t httpGetStatus(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">HTTP status</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpGetSubField2">httpGetSubField2</a></h3>
        <p class="description">Get a sub-field value.</p>
<p class="code">
char *httpGetSubField2(<a href="#http_t">http_t</a> *http, <a href="#http_field_t">http_field_t</a> field, const char *name, char *value, int valuelen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>field</th>
        <td class="description">Field index</td></tr>
<tr><th>name</th>
        <td class="description">Name of sub-field</td></tr>
<tr><th>value</th>
        <td class="description">Value string</td></tr>
<tr><th>valuelen</th>
        <td class="description">Size of value buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Value or <code>NULL</code></p>
<h3 class="function"><a id="httpGetVersion">httpGetVersion</a></h3>
        <p class="description">Get the HTTP version at the other end.</p>
<p class="code">
<a href="#http_version_t">http_version_t</a> httpGetVersion(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Version number</p>
<h3 class="function"><a id="httpGets">httpGets</a></h3>
        <p class="description">Get a line of text from a HTTP connection.</p>
<p class="code">
char *httpGets(char *line, int length, <a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>line</th>
        <td class="description">Line to read into</td></tr>
<tr><th>length</th>
        <td class="description">Max length of buffer</td></tr>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Line or <code>NULL</code></p>
<h3 class="function"><a id="httpHead">httpHead</a></h3>
        <p class="description">Send a HEAD request to the server.</p>
<p class="code">
int httpHead(<a href="#http_t">http_t</a> *http, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI for head</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><a id="httpInitialize">httpInitialize</a></h3>
        <p class="description">Initialize the HTTP interface library and set the
default HTTP proxy (if any).</p>
<p class="code">
void httpInitialize(void);</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpIsChunked">httpIsChunked</a></h3>
        <p class="description">Report whether a message body is chunked.</p>
<p class="code">
int httpIsChunked(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if chunked, 0 if not</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function returns non-zero if the message body is composed of
variable-length chunks.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpIsEncrypted">httpIsEncrypted</a></h3>
        <p class="description">Report whether a connection is encrypted.</p>
<p class="code">
int httpIsEncrypted(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if encrypted, 0 if not</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function returns non-zero if the connection is currently encrypted.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpLoadCredentials">httpLoadCredentials</a></h3>
        <p class="description">Load X.509 credentials from a keychain file.</p>
<p class="code">
int httpLoadCredentials(const char *path, cups_array_t **credentials, const char *common_name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>path</th>
        <td class="description">Keychain path or <code>NULL</code> for default</td></tr>
<tr><th>credentials</th>
        <td class="description">Credentials</td></tr>
<tr><th>common_name</th>
        <td class="description">Common name for credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, -1 on error</p>
<h3 class="function"><a id="httpOptions">httpOptions</a></h3>
        <p class="description">Send an OPTIONS request to the server.</p>
<p class="code">
int httpOptions(<a href="#http_t">http_t</a> *http, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI for options</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpPeek">httpPeek</a></h3>
        <p class="description">Peek at data from a HTTP connection.</p>
<p class="code">
ssize_t httpPeek(<a href="#http_t">http_t</a> *http, char *buffer, size_t length);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>buffer</th>
        <td class="description">Buffer for data</td></tr>
<tr><th>length</th>
        <td class="description">Maximum number of bytes</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of bytes copied</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function copies available data from the given HTTP connection, reading
a buffer as needed.  The data is still available for reading using
<a href="#httpRead2"><code>httpRead2</code></a>.<br>
<br>
For non-blocking connections the usual timeouts apply.

</p>
<h3 class="function"><a id="httpPost">httpPost</a></h3>
        <p class="description">Send a POST request to the server.</p>
<p class="code">
int httpPost(<a href="#http_t">http_t</a> *http, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI for post</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><a id="httpPut">httpPut</a></h3>
        <p class="description">Send a PUT request to the server.</p>
<p class="code">
int httpPut(<a href="#http_t">http_t</a> *http, const char *uri);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI to put</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpRead2">httpRead2</a></h3>
        <p class="description">Read data from a HTTP connection.</p>
<p class="code">
ssize_t httpRead2(<a href="#http_t">http_t</a> *http, char *buffer, size_t length);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>buffer</th>
        <td class="description">Buffer for data</td></tr>
<tr><th>length</th>
        <td class="description">Maximum number of bytes</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of bytes read</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpReadRequest">httpReadRequest</a></h3>
        <p class="description">Read a HTTP request from a connection.</p>
<p class="code">
<a href="#http_state_t">http_state_t</a> httpReadRequest(<a href="#http_t">http_t</a> *http, char *uri, size_t urilen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>uri</th>
        <td class="description">URI buffer</td></tr>
<tr><th>urilen</th>
        <td class="description">Size of URI buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New state of connection</p>
<h3 class="function"><a id="httpReconnect2">httpReconnect2</a></h3>
        <p class="description">Reconnect to a HTTP server with timeout and optional
cancel.</p>
<p class="code">
int httpReconnect2(<a href="#http_t">http_t</a> *http, int msec, int *cancel);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>msec</th>
        <td class="description">Timeout in milliseconds</td></tr>
<tr><th>cancel</th>
        <td class="description">Pointer to &quot;cancel&quot; variable</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, non-zero on failure</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpResolveHostname">httpResolveHostname</a></h3>
        <p class="description">Resolve the hostname of the HTTP connection
address.</p>
<p class="code">
const char *httpResolveHostname(<a href="#http_t">http_t</a> *http, char *buffer, size_t bufsize);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>buffer</th>
        <td class="description">Hostname buffer</td></tr>
<tr><th>bufsize</th>
        <td class="description">Size of buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Resolved hostname or <code>NULL</code></p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpSaveCredentials">httpSaveCredentials</a></h3>
        <p class="description">Save X.509 credentials to a keychain file.</p>
<p class="code">
int httpSaveCredentials(const char *path, cups_array_t *credentials, const char *common_name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>path</th>
        <td class="description">Keychain path or <code>NULL</code> for default</td></tr>
<tr><th>credentials</th>
        <td class="description">Credentials</td></tr>
<tr><th>common_name</th>
        <td class="description">Common name for credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">-1 on error, 0 on success</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpSeparateURI">httpSeparateURI</a></h3>
        <p class="description">Separate a Universal Resource Identifier into its
components.</p>
<p class="code">
<a href="#http_uri_status_t">http_uri_status_t</a> httpSeparateURI(<a href="#http_uri_coding_t">http_uri_coding_t</a> decoding, const char *uri, char *scheme, int schemelen, char *username, int usernamelen, char *host, int hostlen, int *port, char *resource, int resourcelen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>decoding</th>
        <td class="description">Decoding flags</td></tr>
<tr><th>uri</th>
        <td class="description">Universal Resource Identifier</td></tr>
<tr><th>scheme</th>
        <td class="description">Scheme (http, https, etc.)</td></tr>
<tr><th>schemelen</th>
        <td class="description">Size of scheme buffer</td></tr>
<tr><th>username</th>
        <td class="description">Username</td></tr>
<tr><th>usernamelen</th>
        <td class="description">Size of username buffer</td></tr>
<tr><th>host</th>
        <td class="description">Hostname</td></tr>
<tr><th>hostlen</th>
        <td class="description">Size of hostname buffer</td></tr>
<tr><th>port</th>
        <td class="description">Port number to use</td></tr>
<tr><th>resource</th>
        <td class="description">Resource/filename</td></tr>
<tr><th>resourcelen</th>
        <td class="description">Size of resource buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Result of separation</p>
<h3 class="function"><span class="info">&#160;CUPS 1.3/macOS 10.5&#160;</span><a id="httpSetAuthString">httpSetAuthString</a></h3>
        <p class="description">Set the current authorization string.</p>
<p class="code">
void httpSetAuthString(<a href="#http_t">http_t</a> *http, const char *scheme, const char *data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>scheme</th>
        <td class="description">Auth scheme (NULL to clear it)</td></tr>
<tr><th>data</th>
        <td class="description">Auth data (NULL for none)</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function just stores a copy of the current authorization string in
the HTTP connection object.  You must still call <a href="#httpSetField"><code>httpSetField</code></a> to set
<code>HTTP_FIELD_AUTHORIZATION</code> prior to issuing a HTTP request using
<a href="#httpGet"><code>httpGet</code></a>, <a href="#httpHead"><code>httpHead</code></a>, <a href="#httpOptions"><code>httpOptions</code></a>, <a href="#httpPost"><code>httpPost</code></a>, or
<a href="#httpPut"><code>httpPut</code></a>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="httpSetCookie">httpSetCookie</a></h3>
        <p class="description">Set the cookie value(s).</p>
<p class="code">
void httpSetCookie(<a href="#http_t">http_t</a> *http, const char *cookie);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">Connection</td></tr>
<tr><th>cookie</th>
        <td class="description">Cookie string</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="httpSetCredentials">httpSetCredentials</a></h3>
        <p class="description">Set the credentials associated with an encrypted
connection.</p>
<p class="code">
int httpSetCredentials(<a href="#http_t">http_t</a> *http, cups_array_t *credentials);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>credentials</th>
        <td class="description">Array of credentials</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status of call (0 = success)</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpSetDefaultField">httpSetDefaultField</a></h3>
        <p class="description">Set the default value of an HTTP header.</p>
<p class="code">
void httpSetDefaultField(<a href="#http_t">http_t</a> *http, <a href="#http_field_t">http_field_t</a> field, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>field</th>
        <td class="description">Field index</td></tr>
<tr><th>value</th>
        <td class="description">Value</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Currently only <code>HTTP_FIELD_ACCEPT_ENCODING</code>, <code>HTTP_FIELD_SERVER</code>,
and <code>HTTP_FIELD_USER_AGENT</code> can be set.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpSetExpect">httpSetExpect</a></h3>
        <p class="description">Set the Expect: header in a request.</p>
<p class="code">
void httpSetExpect(<a href="#http_t">http_t</a> *http, http_status_t expect);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>expect</th>
        <td class="description">HTTP status to expect
(<code>HTTP_STATUS_CONTINUE</code>)</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Currently only <code>HTTP_STATUS_CONTINUE</code> is supported for the &quot;expect&quot;
argument.

</p>
<h3 class="function"><a id="httpSetField">httpSetField</a></h3>
        <p class="description">Set the value of an HTTP header.</p>
<p class="code">
void httpSetField(<a href="#http_t">http_t</a> *http, <a href="#http_field_t">http_field_t</a> field, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>field</th>
        <td class="description">Field index</td></tr>
<tr><th>value</th>
        <td class="description">Value</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpSetKeepAlive">httpSetKeepAlive</a></h3>
        <p class="description">Set the current Keep-Alive state of a connection.</p>
<p class="code">
void httpSetKeepAlive(<a href="#http_t">http_t</a> *http, <a href="#http_keepalive_t">http_keepalive_t</a> keep_alive);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>keep_alive</th>
        <td class="description">New Keep-Alive value</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpSetLength">httpSetLength</a></h3>
        <p class="description">Set the content-length and content-encoding.</p>
<p class="code">
void httpSetLength(<a href="#http_t">http_t</a> *http, size_t length);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>length</th>
        <td class="description">Length (0 for chunked)</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span><a id="httpSetTimeout">httpSetTimeout</a></h3>
        <p class="description">Set read/write timeouts and an optional callback.</p>
<p class="code">
void httpSetTimeout(<a href="#http_t">http_t</a> *http, double timeout, <a href="#http_timeout_cb_t">http_timeout_cb_t</a> cb, void *user_data);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>timeout</th>
        <td class="description">Number of seconds for timeout,
must be greater than 0</td></tr>
<tr><th>cb</th>
        <td class="description">Callback function or <code>NULL</code></td></tr>
<tr><th>user_data</th>
        <td class="description">User data pointer</td></tr>
</tbody></table>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The optional timeout callback receives both the HTTP connection and a user
data pointer and must return 1 to continue or 0 to error (time) out.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpShutdown">httpShutdown</a></h3>
        <p class="description">Shutdown one side of an HTTP connection.</p>
<p class="code">
void httpShutdown(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpStateString">httpStateString</a></h3>
        <p class="description">Return the string describing a HTTP state value.</p>
<p class="code">
const char *httpStateString(<a href="#http_state_t">http_state_t</a> state);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>state</th>
        <td class="description">HTTP state value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">State string</p>
<h3 class="function"><a id="httpStatus">httpStatus</a></h3>
        <p class="description">Return a short string describing a HTTP status code.</p>
<p class="code">
const char *httpStatus(http_status_t status);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>status</th>
        <td class="description">HTTP status code</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Localized status string</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned string is localized to the current POSIX locale and is based
on the status strings defined in RFC 7231.</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="httpURIStatusString">httpURIStatusString</a></h3>
        <p class="description">Return a string describing a URI status code.</p>
<p class="code">
const char *httpURIStatusString(<a href="#http_uri_status_t">http_uri_status_t</a> status);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>status</th>
        <td class="description">URI status code</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Localized status string</p>
<h3 class="function"><a id="httpUpdate">httpUpdate</a></h3>
        <p class="description">Update the current HTTP state for incoming data.</p>
<p class="code">
http_status_t httpUpdate(<a href="#http_t">http_t</a> *http);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">HTTP status</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="httpWait">httpWait</a></h3>
        <p class="description">Wait for data available on a connection.</p>
<p class="code">
int httpWait(<a href="#http_t">http_t</a> *http, int msec);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>msec</th>
        <td class="description">Milliseconds to wait</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if data is available, 0 otherwise</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="httpWrite2">httpWrite2</a></h3>
        <p class="description">Write data to a HTTP connection.</p>
<p class="code">
ssize_t httpWrite2(<a href="#http_t">http_t</a> *http, const char *buffer, size_t length);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>buffer</th>
        <td class="description">Buffer for data</td></tr>
<tr><th>length</th>
        <td class="description">Number of bytes to write</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of bytes written</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="httpWriteResponse">httpWriteResponse</a></h3>
        <p class="description">Write a HTTP response to a client connection.</p>
<p class="code">
int httpWriteResponse(<a href="#http_t">http_t</a> *http, http_status_t status);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>status</th>
        <td class="description">Status code</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">0 on success, -1 on error</p>
<h3 class="function"><a id="ippAddBoolean">ippAddBoolean</a></h3>
        <p class="description">Add a boolean attribute to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddBoolean(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, char value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>value</th>
        <td class="description">Value of attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).</p>
<h3 class="function"><a id="ippAddBooleans">ippAddBooleans</a></h3>
        <p class="description">Add an array of boolean values.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddBooleans(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, int num_values, const char *values);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>num_values</th>
        <td class="description">Number of values</td></tr>
<tr><th>values</th>
        <td class="description">Values</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="ippAddCollection">ippAddCollection</a></h3>
        <p class="description">Add a collection value.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddCollection(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, <a href="#ipp_t">ipp_t</a> *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>value</th>
        <td class="description">Value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="ippAddCollections">ippAddCollections</a></h3>
        <p class="description">Add an array of collection values.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddCollections(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, int num_values, const <a href="#ipp_t">ipp_t</a> **values);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>num_values</th>
        <td class="description">Number of values</td></tr>
<tr><th>values</th>
        <td class="description">Values</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).

</p>
<h3 class="function"><a id="ippAddDate">ippAddDate</a></h3>
        <p class="description">Add a dateTime attribute to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddDate(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, const <a href="#ipp_uchar_t">ipp_uchar_t</a> *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>value</th>
        <td class="description">Value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).</p>
<h3 class="function"><a id="ippAddInteger">ippAddInteger</a></h3>
        <p class="description">Add a integer attribute to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddInteger(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name, int value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>value</th>
        <td class="description">Value of attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported values include enum (<code>IPP_TAG_ENUM</code>) and integer
(<code>IPP_TAG_INTEGER</code>).</p>
<h3 class="function"><a id="ippAddIntegers">ippAddIntegers</a></h3>
        <p class="description">Add an array of integer values.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddIntegers(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name, int num_values, const int *values);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>num_values</th>
        <td class="description">Number of values</td></tr>
<tr><th>values</th>
        <td class="description">Values</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported values include enum (<code>IPP_TAG_ENUM</code>) and integer
(<code>IPP_TAG_INTEGER</code>).</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippAddOctetString">ippAddOctetString</a></h3>
        <p class="description">Add an octetString value to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddOctetString(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, const void *data, int datalen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>data</th>
        <td class="description">octetString data</td></tr>
<tr><th>datalen</th>
        <td class="description">Length of data in bytes</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippAddOutOfBand">ippAddOutOfBand</a></h3>
        <p class="description">Add an out-of-band value to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddOutOfBand(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported out-of-band values include unsupported-value
(<code>IPP_TAG_UNSUPPORTED_VALUE</code>), default (<code>IPP_TAG_DEFAULT</code>), unknown
(<code>IPP_TAG_UNKNOWN</code>), no-value (<code>IPP_TAG_NOVALUE</code>), not-settable
(<code>IPP_TAG_NOTSETTABLE</code>), delete-attribute (<code>IPP_TAG_DELETEATTR</code>), and
admin-define (<code>IPP_TAG_ADMINDEFINE</code>).

</p>
<h3 class="function"><a id="ippAddRange">ippAddRange</a></h3>
        <p class="description">Add a range of values to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddRange(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, int lower, int upper);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>lower</th>
        <td class="description">Lower value</td></tr>
<tr><th>upper</th>
        <td class="description">Upper value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
The <code>lower</code> parameter must be less than or equal to the <code>upper</code> parameter.</p>
<h3 class="function"><a id="ippAddRanges">ippAddRanges</a></h3>
        <p class="description">Add ranges of values to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddRanges(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, int num_values, const int *lower, const int *upper);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>num_values</th>
        <td class="description">Number of values</td></tr>
<tr><th>lower</th>
        <td class="description">Lower values</td></tr>
<tr><th>upper</th>
        <td class="description">Upper values</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).</p>
<h3 class="function"><a id="ippAddResolution">ippAddResolution</a></h3>
        <p class="description">Add a resolution value to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddResolution(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, <a href="#ipp_res_t">ipp_res_t</a> units, int xres, int yres);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>units</th>
        <td class="description">Units for resolution</td></tr>
<tr><th>xres</th>
        <td class="description">X resolution</td></tr>
<tr><th>yres</th>
        <td class="description">Y resolution</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).</p>
<h3 class="function"><a id="ippAddResolutions">ippAddResolutions</a></h3>
        <p class="description">Add resolution values to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddResolutions(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, const char *name, int num_values, <a href="#ipp_res_t">ipp_res_t</a> units, const int *xres, const int *yres);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>num_values</th>
        <td class="description">Number of values</td></tr>
<tr><th>units</th>
        <td class="description">Units for resolution</td></tr>
<tr><th>xres</th>
        <td class="description">X resolutions</td></tr>
<tr><th>yres</th>
        <td class="description">Y resolutions</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).</p>
<h3 class="function"><a id="ippAddSeparator">ippAddSeparator</a></h3>
        <p class="description">Add a group separator to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddSeparator(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.</p>
<h3 class="function"><a id="ippAddString">ippAddString</a></h3>
        <p class="description">Add a language-encoded string to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddString(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name, const char *language, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>language</th>
        <td class="description">Language code</td></tr>
<tr><th>value</th>
        <td class="description">Value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported string values include charset (<code>IPP_TAG_CHARSET</code>), keyword
(<code>IPP_TAG_KEYWORD</code>), language (<code>IPP_TAG_LANGUAGE</code>), mimeMediaType
(<code>IPP_TAG_MIMETYPE</code>), name (<code>IPP_TAG_NAME</code>), nameWithLanguage
(<code>IPP_TAG_NAMELANG), text (</code>code IPP_TAG_TEXT@), textWithLanguage
(<code>IPP_TAG_TEXTLANG</code>), uri (<code>IPP_TAG_URI</code>), and uriScheme
(<code>IPP_TAG_URISCHEME</code>).<br>
<br>
The <code>language</code> parameter must be non-<code>NULL</code> for nameWithLanguage and
textWithLanguage string values and must be <code>NULL</code> for all other string values.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippAddStringf">ippAddStringf</a></h3>
        <p class="description">Add a formatted string to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddStringf(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name, const char *language, const char *format, ...);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>language</th>
        <td class="description">Language code (<code>NULL</code> for default)</td></tr>
<tr><th>format</th>
        <td class="description">Printf-style format string</td></tr>
<tr><th>...</th>
        <td class="description">Additional arguments as needed</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document
(<code>IPP_TAG_DOCUMENT</code>), event notification
(<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation (<code>IPP_TAG_OPERATION</code>),
printer (<code>IPP_TAG_PRINTER</code>), subscription (<code>IPP_TAG_SUBSCRIPTION</code>),
or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported string values include charset (<code>IPP_TAG_CHARSET</code>), keyword
(<code>IPP_TAG_KEYWORD</code>), language (<code>IPP_TAG_LANGUAGE</code>), mimeMediaType
(<code>IPP_TAG_MIMETYPE</code>), name (<code>IPP_TAG_NAME</code>), nameWithLanguage
(<code>IPP_TAG_NAMELANG), text (</code>code IPP_TAG_TEXT@), textWithLanguage
(<code>IPP_TAG_TEXTLANG</code>), uri (<code>IPP_TAG_URI</code>), and uriScheme
(<code>IPP_TAG_URISCHEME</code>).<br>
<br>
The <code>language</code> parameter must be non-<code>NULL</code> for nameWithLanguage
and textWithLanguage string values and must be <code>NULL</code> for all other
string values.<br>
<br>
The <code>format</code> parameter uses formatting characters compatible with the
printf family of standard functions.  Additional arguments follow it as
needed.  The formatted string is truncated as needed to the maximum length of
the corresponding value type.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippAddStringfv">ippAddStringfv</a></h3>
        <p class="description">Add a formatted string to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddStringfv(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name, const char *language, const char *format, va_list ap);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>language</th>
        <td class="description">Language code (<code>NULL</code> for default)</td></tr>
<tr><th>format</th>
        <td class="description">Printf-style format string</td></tr>
<tr><th>ap</th>
        <td class="description">Additional arguments</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document
(<code>IPP_TAG_DOCUMENT</code>), event notification
(<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation (<code>IPP_TAG_OPERATION</code>),
printer (<code>IPP_TAG_PRINTER</code>), subscription (<code>IPP_TAG_SUBSCRIPTION</code>),
or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported string values include charset (<code>IPP_TAG_CHARSET</code>), keyword
(<code>IPP_TAG_KEYWORD</code>), language (<code>IPP_TAG_LANGUAGE</code>), mimeMediaType
(<code>IPP_TAG_MIMETYPE</code>), name (<code>IPP_TAG_NAME</code>), nameWithLanguage
(<code>IPP_TAG_NAMELANG), text (</code>code IPP_TAG_TEXT@), textWithLanguage
(<code>IPP_TAG_TEXTLANG</code>), uri (<code>IPP_TAG_URI</code>), and uriScheme
(<code>IPP_TAG_URISCHEME</code>).<br>
<br>
The <code>language</code> parameter must be non-<code>NULL</code> for nameWithLanguage
and textWithLanguage string values and must be <code>NULL</code> for all other
string values.<br>
<br>
The <code>format</code> parameter uses formatting characters compatible with the
printf family of standard functions.  Additional arguments are passed in the
stdarg pointer <code>ap</code>.  The formatted string is truncated as needed to the
maximum length of the corresponding value type.

</p>
<h3 class="function"><a id="ippAddStrings">ippAddStrings</a></h3>
        <p class="description">Add language-encoded strings to an IPP message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippAddStrings(<a href="#ipp_t">ipp_t</a> *ipp, ipp_tag_t group, ipp_tag_t value_tag, const char *name, int num_values, const char *language, const char *const *values);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>group</th>
        <td class="description">IPP group</td></tr>
<tr><th>value_tag</th>
        <td class="description">Type of attribute</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>num_values</th>
        <td class="description">Number of values</td></tr>
<tr><th>language</th>
        <td class="description">Language code (<code>NULL</code> for default)</td></tr>
<tr><th>values</th>
        <td class="description">Values</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).<br>
<br>
Supported string values include charset (<code>IPP_TAG_CHARSET</code>), keyword
(<code>IPP_TAG_KEYWORD</code>), language (<code>IPP_TAG_LANGUAGE</code>), mimeMediaType
(<code>IPP_TAG_MIMETYPE</code>), name (<code>IPP_TAG_NAME</code>), nameWithLanguage
(<code>IPP_TAG_NAMELANG), text (</code>code IPP_TAG_TEXT@), textWithLanguage
(<code>IPP_TAG_TEXTLANG</code>), uri (<code>IPP_TAG_URI</code>), and uriScheme
(<code>IPP_TAG_URISCHEME</code>).<br>
<br>
The <code>language</code> parameter must be non-<code>NULL</code> for nameWithLanguage and
textWithLanguage string values and must be <code>NULL</code> for all other string values.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippAttributeString">ippAttributeString</a></h3>
        <p class="description">Convert the attribute's value to a string.</p>
<p class="code">
size_t ippAttributeString(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, char *buffer, size_t bufsize);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">Attribute</td></tr>
<tr><th>buffer</th>
        <td class="description">String buffer or NULL</td></tr>
<tr><th>bufsize</th>
        <td class="description">Size of string buffer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of bytes less nul</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns the number of bytes that would be written, not including the
trailing nul. The buffer pointer can be NULL to get the required length,
just like (v)snprintf.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippContainsInteger">ippContainsInteger</a></h3>
        <p class="description">Determine whether an attribute contains the
specified value or is within the list of ranges.</p>
<p class="code">
int ippContainsInteger(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">Attribute</td></tr>
<tr><th>value</th>
        <td class="description">Integer/enum value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on a match, 0 on no match</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns non-zero when the attribute contains either a matching integer or
enum value, or the value falls within one of the rangeOfInteger values for
the attribute.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippContainsString">ippContainsString</a></h3>
        <p class="description">Determine whether an attribute contains the
specified string value.</p>
<p class="code">
int ippContainsString(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, const char *value);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">Attribute</td></tr>
<tr><th>value</th>
        <td class="description">String value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on a match, 0 on no match</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Returns non-zero when the attribute contains a matching charset, keyword,
naturalLanguage, mimeMediaType, name, text, uri, or uriScheme value.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippCopyAttribute">ippCopyAttribute</a></h3>
        <p class="description">Copy an attribute.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippCopyAttribute(<a href="#ipp_t">ipp_t</a> *dst, <a href="#ipp_attribute_t">ipp_attribute_t</a> *srcattr, int quickcopy);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>dst</th>
        <td class="description">Destination IPP message</td></tr>
<tr><th>srcattr</th>
        <td class="description">Attribute to copy</td></tr>
<tr><th>quickcopy</th>
        <td class="description">1 for a referenced copy, 0 for normal</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The specified attribute, <code>attr</code>, is copied to the destination IPP message.
When <code>quickcopy</code> is non-zero, a &quot;shallow&quot; reference copy of the attribute is
created - this should only be done as long as the original source IPP message will
not be freed for the life of the destination.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippCopyAttributes">ippCopyAttributes</a></h3>
        <p class="description">Copy attributes from one IPP message to another.</p>
<p class="code">
int ippCopyAttributes(<a href="#ipp_t">ipp_t</a> *dst, <a href="#ipp_t">ipp_t</a> *src, int quickcopy, <a href="#ipp_copycb_t">ipp_copycb_t</a> cb, void *context);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>dst</th>
        <td class="description">Destination IPP message</td></tr>
<tr><th>src</th>
        <td class="description">Source IPP message</td></tr>
<tr><th>quickcopy</th>
        <td class="description">1 for a referenced copy, 0 for normal</td></tr>
<tr><th>cb</th>
        <td class="description">Copy callback or <code>NULL</code> for none</td></tr>
<tr><th>context</th>
        <td class="description">Context pointer</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Zero or more attributes are copied from the source IPP message, <code>src</code>, to the
destination IPP message, <code>dst</code>. When <code>quickcopy</code> is non-zero, a &quot;shallow&quot;
reference copy of the attribute is created - this should only be done as long as the
original source IPP message will not be freed for the life of the destination.<br>
<br>
The <code>cb</code> and <code>context</code> parameters provide a generic way to &quot;filter&quot; the
attributes that are copied - the function must return 1 to copy the attribute or
0 to skip it. The function may also choose to do a partial copy of the source attribute
itself.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippCreateRequestedArray">ippCreateRequestedArray</a></h3>
        <p class="description">Create a CUPS array of attribute names from the
given requested-attributes attribute.</p>
<p class="code">
cups_array_t *ippCreateRequestedArray(<a href="#ipp_t">ipp_t</a> *request);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>request</th>
        <td class="description">IPP request</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">CUPS array or <code>NULL</code> if all</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function creates a (sorted) CUPS array of attribute names matching the
list of &quot;requested-attribute&quot; values supplied in an IPP request.  All IANA-
registered values are supported in addition to the CUPS IPP extension
attributes.<br>
<br>
The <code>request</code> parameter specifies the request message that was read from
the client.

<code>NULL</code> is returned if all attributes should be returned.  Otherwise, the
result is a sorted array of attribute names, where <code>cupsArrayFind(array,
"attribute-name")</code> will return a non-NULL pointer.  The array must be freed
using the <code>cupsArrayDelete</code> function.

</p>
<h3 class="function"><a id="ippDateToTime">ippDateToTime</a></h3>
        <p class="description">Convert from RFC 2579 Date/Time format to time in
seconds.</p>
<p class="code">
time_t ippDateToTime(const <a href="#ipp_uchar_t">ipp_uchar_t</a> *date);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>date</th>
        <td class="description">RFC 2579 date info</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">UNIX time value</p>
<h3 class="function"><a id="ippDelete">ippDelete</a></h3>
        <p class="description">Delete an IPP message.</p>
<p class="code">
void ippDelete(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="ippDeleteAttribute">ippDeleteAttribute</a></h3>
        <p class="description">Delete a single attribute in an IPP message.</p>
<p class="code">
void ippDeleteAttribute(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> *attr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">Attribute to delete</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippDeleteValues">ippDeleteValues</a></h3>
        <p class="description">Delete values in an attribute.</p>
<p class="code">
int ippDeleteValues(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, int count);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">Attribute</td></tr>
<tr><th>element</th>
        <td class="description">Index of first value to delete (0-based)</td></tr>
<tr><th>count</th>
        <td class="description">Number of values to delete</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies the first value to delete, starting at
0. It must be less than the number of values returned by <a href="#ippGetCount"><code>ippGetCount</code></a>.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
Deleting all values in an attribute deletes the attribute.

</p>
<h3 class="function"><a id="ippEnumString">ippEnumString</a></h3>
        <p class="description">Return a string corresponding to the enum value.</p>
<p class="code">
const char *ippEnumString(const char *attrname, int enumvalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attrname</th>
        <td class="description">Attribute name</td></tr>
<tr><th>enumvalue</th>
        <td class="description">Enum value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Enum string</p>
<h3 class="function"><a id="ippEnumValue">ippEnumValue</a></h3>
        <p class="description">Return the value associated with a given enum string.</p>
<p class="code">
int ippEnumValue(const char *attrname, const char *enumstring);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attrname</th>
        <td class="description">Attribute name</td></tr>
<tr><th>enumstring</th>
        <td class="description">Enum string</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Enum value or -1 if unknown</p>
<h3 class="function"><a id="ippErrorString">ippErrorString</a></h3>
        <p class="description">Return a name for the given status code.</p>
<p class="code">
const char *ippErrorString(ipp_status_t error);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>error</th>
        <td class="description">Error status</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Text string</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippErrorValue">ippErrorValue</a></h3>
        <p class="description">Return a status code for the given name.</p>
<p class="code">
ipp_status_t ippErrorValue(const char *name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">IPP status code</p>
<h3 class="function"><a id="ippFindAttribute">ippFindAttribute</a></h3>
        <p class="description">Find a named attribute in a request.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippFindAttribute(<a href="#ipp_t">ipp_t</a> *ipp, const char *name, ipp_tag_t type);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>type</th>
        <td class="description">Type of attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Matching attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Starting with CUPS 2.0, the attribute name can contain a hierarchical list
of attribute and member names separated by slashes, for example
&quot;media-col/media-size&quot;.</p>
<h3 class="function"><a id="ippFindNextAttribute">ippFindNextAttribute</a></h3>
        <p class="description">Find the next named attribute in a request.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippFindNextAttribute(<a href="#ipp_t">ipp_t</a> *ipp, const char *name, ipp_tag_t type);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>name</th>
        <td class="description">Name of attribute</td></tr>
<tr><th>type</th>
        <td class="description">Type of attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Matching attribute</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">Starting with CUPS 2.0, the attribute name can contain a hierarchical list
of attribute and member names separated by slashes, for example
&quot;media-col/media-size&quot;.</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippFirstAttribute">ippFirstAttribute</a></h3>
        <p class="description">Return the first attribute in the message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippFirstAttribute(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">First attribute or <code>NULL</code> if none</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetBoolean">ippGetBoolean</a></h3>
        <p class="description">Get a boolean value for an attribute.</p>
<p class="code">
int ippGetBoolean(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Boolean value or 0 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetCollection">ippGetCollection</a></h3>
        <p class="description">Get a collection value for an attribute.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *ippGetCollection(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Collection value or <code>NULL</code> on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetCount">ippGetCount</a></h3>
        <p class="description">Get the number of values in an attribute.</p>
<p class="code">
int ippGetCount(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Number of values or 0 on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetDate">ippGetDate</a></h3>
        <p class="description">Get a dateTime value for an attribute.</p>
<p class="code">
const <a href="#ipp_uchar_t">ipp_uchar_t</a> *ippGetDate(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">dateTime value or <code>NULL</code></p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetGroupTag">ippGetGroupTag</a></h3>
        <p class="description">Get the group associated with an attribute.</p>
<p class="code">
ipp_tag_t ippGetGroupTag(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Group tag or <code>IPP_TAG_ZERO</code> on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetInteger">ippGetInteger</a></h3>
        <p class="description">Get the integer/enum value for an attribute.</p>
<p class="code">
int ippGetInteger(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Value or 0 on error</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetName">ippGetName</a></h3>
        <p class="description">Get the attribute name.</p>
<p class="code">
const char *ippGetName(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Attribute name or <code>NULL</code> for separators</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippGetOctetString">ippGetOctetString</a></h3>
        <p class="description">Get an octetString value from an IPP attribute.</p>
<p class="code">
void *ippGetOctetString(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element, int *datalen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>datalen</th>
        <td class="description">Length of octetString data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Pointer to octetString data</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetOperation">ippGetOperation</a></h3>
        <p class="description">Get the operation ID in an IPP message.</p>
<p class="code">
ipp_op_t ippGetOperation(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP request message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Operation ID or 0 on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetRange">ippGetRange</a></h3>
        <p class="description">Get a rangeOfInteger value from an attribute.</p>
<p class="code">
int ippGetRange(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element, int *uppervalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>uppervalue</th>
        <td class="description">Upper value of range</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Lower value of range or 0</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetRequestId">ippGetRequestId</a></h3>
        <p class="description">Get the request ID from an IPP message.</p>
<p class="code">
int ippGetRequestId(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Request ID or 0 on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetResolution">ippGetResolution</a></h3>
        <p class="description">Get a resolution value for an attribute.</p>
<p class="code">
int ippGetResolution(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element, int *yres, <a href="#ipp_res_t">ipp_res_t</a> *units);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>yres</th>
        <td class="description">Vertical/feed resolution</td></tr>
<tr><th>units</th>
        <td class="description">Units for resolution</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Horizontal/cross feed resolution or 0</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetState">ippGetState</a></h3>
        <p class="description">Get the IPP message state.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippGetState(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">IPP message state value</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetStatusCode">ippGetStatusCode</a></h3>
        <p class="description">Get the status code from an IPP response or event message.</p>
<p class="code">
ipp_status_t ippGetStatusCode(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP response or event message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Status code in IPP message</p>
<h3 class="function"><a id="ippGetString">ippGetString</a></h3>
        <p class="description"></p>
<p class="code">
const char *ippGetString(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr, int element, const char **language);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>language</th>
        <td class="description">Language code (<code>NULL</code> for don't care)</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Get the string and optionally the language code for an attribute.</p>
        <p class="discussion">The <code>element</code> parameter specifies which value to get from 0 to
<code>ippGetCount(attr)</code> - 1.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetValueTag">ippGetValueTag</a></h3>
        <p class="description">Get the value tag for an attribute.</p>
<p class="code">
ipp_tag_t ippGetValueTag(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Value tag or <code>IPP_TAG_ZERO</code> on error</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippGetVersion">ippGetVersion</a></h3>
        <p class="description">Get the major and minor version number from an IPP message.</p>
<p class="code">
int ippGetVersion(<a href="#ipp_t">ipp_t</a> *ipp, int *minor);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>minor</th>
        <td class="description">Minor version number or <code>NULL</code> for don't care</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Major version number or 0 on error</p>
<h3 class="function"><a id="ippLength">ippLength</a></h3>
        <p class="description">Compute the length of an IPP message.</p>
<p class="code">
size_t ippLength(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Size of IPP message</p>
<h3 class="function"><a id="ippNew">ippNew</a></h3>
        <p class="description">Allocate a new IPP message.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *ippNew(void);</p>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">New IPP message</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippNewRequest">ippNewRequest</a></h3>
        <p class="description">Allocate a new IPP request message.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *ippNewRequest(ipp_op_t op);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>op</th>
        <td class="description">Operation code</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">IPP request message</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The new request message is initialized with the &quot;attributes-charset&quot; and
&quot;attributes-natural-language&quot; attributes added. The
&quot;attributes-natural-language&quot; value is derived from the current locale.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippNewResponse">ippNewResponse</a></h3>
        <p class="description">Allocate a new IPP response message.</p>
<p class="code">
<a href="#ipp_t">ipp_t</a> *ippNewResponse(<a href="#ipp_t">ipp_t</a> *request);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>request</th>
        <td class="description">IPP request message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">IPP response message</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The new response message is initialized with the same &quot;version-number&quot;,
&quot;request-id&quot;, &quot;attributes-charset&quot;, and &quot;attributes-natural-language&quot; as the
provided request message.  If the &quot;attributes-charset&quot; or
&quot;attributes-natural-language&quot; attributes are missing from the request,
'utf-8' and a value derived from the current locale are substituted,
respectively.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippNextAttribute">ippNextAttribute</a></h3>
        <p class="description">Return the next attribute in the message.</p>
<p class="code">
<a href="#ipp_attribute_t">ipp_attribute_t</a> *ippNextAttribute(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Next attribute or <code>NULL</code> if none</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippOpString">ippOpString</a></h3>
        <p class="description">Return a name for the given operation id.</p>
<p class="code">
const char *ippOpString(ipp_op_t op);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>op</th>
        <td class="description">Operation ID</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Name</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippOpValue">ippOpValue</a></h3>
        <p class="description">Return an operation id for the given name.</p>
<p class="code">
ipp_op_t ippOpValue(const char *name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Textual name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Operation ID</p>
<h3 class="function"><a id="ippPort">ippPort</a></h3>
        <p class="description">Return the default IPP port number.</p>
<p class="code">
int ippPort(void);</p>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Port number</p>
<h3 class="function"><a id="ippRead">ippRead</a></h3>
        <p class="description">Read data for an IPP message from a HTTP connection.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippRead(<a href="#http_t">http_t</a> *http, <a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>ipp</th>
        <td class="description">IPP data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="ippReadFile">ippReadFile</a></h3>
        <p class="description">Read data for an IPP message from a file.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippReadFile(int fd, <a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>fd</th>
        <td class="description">HTTP data</td></tr>
<tr><th>ipp</th>
        <td class="description">IPP data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippReadIO">ippReadIO</a></h3>
        <p class="description">Read data for an IPP message.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippReadIO(void *src, <a href="#ipp_iocb_t">ipp_iocb_t</a> cb, int blocking, <a href="#ipp_t">ipp_t</a> *parent, <a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>src</th>
        <td class="description">Data source</td></tr>
<tr><th>cb</th>
        <td class="description">Read callback function</td></tr>
<tr><th>blocking</th>
        <td class="description">Use blocking IO?</td></tr>
<tr><th>parent</th>
        <td class="description">Parent request, if any</td></tr>
<tr><th>ipp</th>
        <td class="description">IPP data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetBoolean">ippSetBoolean</a></h3>
        <p class="description">Set a boolean value in an attribute.</p>
<p class="code">
int ippSetBoolean(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, int boolvalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>boolvalue</th>
        <td class="description">Boolean value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetCollection">ippSetCollection</a></h3>
        <p class="description">Set a collection value in an attribute.</p>
<p class="code">
int ippSetCollection(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, <a href="#ipp_t">ipp_t</a> *colvalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>colvalue</th>
        <td class="description">Collection value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetDate">ippSetDate</a></h3>
        <p class="description">Set a dateTime value in an attribute.</p>
<p class="code">
int ippSetDate(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, const <a href="#ipp_uchar_t">ipp_uchar_t</a> *datevalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>datevalue</th>
        <td class="description">dateTime value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetGroupTag">ippSetGroupTag</a></h3>
        <p class="description">Set the group tag of an attribute.</p>
<p class="code">
int ippSetGroupTag(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, ipp_tag_t group_tag);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">Attribute</td></tr>
<tr><th>group_tag</th>
        <td class="description">Group tag</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>group</code> parameter specifies the IPP attribute group tag: none
(<code>IPP_TAG_ZERO</code>, for member attributes), document (<code>IPP_TAG_DOCUMENT</code>),
event notification (<code>IPP_TAG_EVENT_NOTIFICATION</code>), operation
(<code>IPP_TAG_OPERATION</code>), printer (<code>IPP_TAG_PRINTER</code>), subscription
(<code>IPP_TAG_SUBSCRIPTION</code>), or unsupported (<code>IPP_TAG_UNSUPPORTED_GROUP</code>).

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetInteger">ippSetInteger</a></h3>
        <p class="description">Set an integer or enum value in an attribute.</p>
<p class="code">
int ippSetInteger(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, int intvalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>intvalue</th>
        <td class="description">Integer/enum value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetName">ippSetName</a></h3>
        <p class="description">Set the name of an attribute.</p>
<p class="code">
int ippSetName(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, const char *name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>name</th>
        <td class="description">Attribute name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippSetOctetString">ippSetOctetString</a></h3>
        <p class="description">Set an octetString value in an IPP attribute.</p>
<p class="code">
int ippSetOctetString(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, const void *data, int datalen);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>data</th>
        <td class="description">Pointer to octetString data</td></tr>
<tr><th>datalen</th>
        <td class="description">Length of octetString data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetOperation">ippSetOperation</a></h3>
        <p class="description">Set the operation ID in an IPP request message.</p>
<p class="code">
int ippSetOperation(<a href="#ipp_t">ipp_t</a> *ipp, ipp_op_t op);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP request message</td></tr>
<tr><th>op</th>
        <td class="description">Operation ID</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.

</p>
<h3 class="function"><a id="ippSetPort">ippSetPort</a></h3>
        <p class="description">Set the default port number.</p>
<p class="code">
void ippSetPort(int p);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>p</th>
        <td class="description">Port number to use</td></tr>
</tbody></table>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetRange">ippSetRange</a></h3>
        <p class="description">Set a rangeOfInteger value in an attribute.</p>
<p class="code">
int ippSetRange(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, int lowervalue, int uppervalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>lowervalue</th>
        <td class="description">Lower bound for range</td></tr>
<tr><th>uppervalue</th>
        <td class="description">Upper bound for range</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetRequestId">ippSetRequestId</a></h3>
        <p class="description">Set the request ID in an IPP message.</p>
<p class="code">
int ippSetRequestId(<a href="#ipp_t">ipp_t</a> *ipp, int request_id);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>request_id</th>
        <td class="description">Request ID</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>request_id</code> parameter must be greater than 0.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetResolution">ippSetResolution</a></h3>
        <p class="description">Set a resolution value in an attribute.</p>
<p class="code">
int ippSetResolution(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, <a href="#ipp_res_t">ipp_res_t</a> unitsvalue, int xresvalue, int yresvalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>unitsvalue</th>
        <td class="description">Resolution units</td></tr>
<tr><th>xresvalue</th>
        <td class="description">Horizontal/cross feed resolution</td></tr>
<tr><th>yresvalue</th>
        <td class="description">Vertical/feed resolution</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetState">ippSetState</a></h3>
        <p class="description">Set the current state of the IPP message.</p>
<p class="code">
int ippSetState(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_state_t">ipp_state_t</a> state);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>state</th>
        <td class="description">IPP state value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetStatusCode">ippSetStatusCode</a></h3>
        <p class="description">Set the status code in an IPP response or event message.</p>
<p class="code">
int ippSetStatusCode(<a href="#ipp_t">ipp_t</a> *ipp, ipp_status_t status);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP response or event message</td></tr>
<tr><th>status</th>
        <td class="description">Status code</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetString">ippSetString</a></h3>
        <p class="description">Set a string value in an attribute.</p>
<p class="code">
int ippSetString(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, const char *strvalue);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>strvalue</th>
        <td class="description">String value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippSetStringf">ippSetStringf</a></h3>
        <p class="description">Set a formatted string value of an attribute.</p>
<p class="code">
int ippSetStringf(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, const char *format, ...);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>format</th>
        <td class="description">Printf-style format string</td></tr>
<tr><th>...</th>
        <td class="description">Additional arguments as needed</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.<br>
<br>
The <code>format</code> parameter uses formatting characters compatible with the
printf family of standard functions.  Additional arguments follow it as
needed.  The formatted string is truncated as needed to the maximum length of
the corresponding value type.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippSetStringfv">ippSetStringfv</a></h3>
        <p class="description">Set a formatted string value of an attribute.</p>
<p class="code">
int ippSetStringfv(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, int element, const char *format, va_list ap);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>element</th>
        <td class="description">Value number (0-based)</td></tr>
<tr><th>format</th>
        <td class="description">Printf-style format string</td></tr>
<tr><th>ap</th>
        <td class="description">Pointer to additional arguments</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
The <code>element</code> parameter specifies which value to set from 0 to
<code>ippGetCount(attr)</code>.<br>
<br>
The <code>format</code> parameter uses formatting characters compatible with the
printf family of standard functions.  Additional arguments follow it as
needed.  The formatted string is truncated as needed to the maximum length of
the corresponding value type.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetValueTag">ippSetValueTag</a></h3>
        <p class="description">Set the value tag of an attribute.</p>
<p class="code">
int ippSetValueTag(<a href="#ipp_t">ipp_t</a> *ipp, <a href="#ipp_attribute_t">ipp_attribute_t</a> **attr, ipp_tag_t value_tag);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>attr</th>
        <td class="description">IPP attribute</td></tr>
<tr><th>value_tag</th>
        <td class="description">Value tag</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The <code>attr</code> parameter may be modified as a result of setting the value.<br>
<br>
Integer (<code>IPP_TAG_INTEGER</code>) values can be promoted to rangeOfInteger
(<code>IPP_TAG_RANGE</code>) values, the various string tags can be promoted to name
(<code>IPP_TAG_NAME</code>) or nameWithLanguage (<code>IPP_TAG_NAMELANG</code>) values, text
(<code>IPP_TAG_TEXT</code>) values can be promoted to textWithLanguage
(<code>IPP_TAG_TEXTLANG</code>) values, and all values can be demoted to the various
out-of-band value tags such as no-value (<code>IPP_TAG_NOVALUE</code>). All other changes
will be rejected.<br>
<br>
Promoting a string attribute to nameWithLanguage or textWithLanguage adds the language
code in the &quot;attributes-natural-language&quot; attribute or, if not present, the language
code for the current locale.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="ippSetVersion">ippSetVersion</a></h3>
        <p class="description">Set the version number in an IPP message.</p>
<p class="code">
int ippSetVersion(<a href="#ipp_t">ipp_t</a> *ipp, int major, int minor);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
<tr><th>major</th>
        <td class="description">Major version number (major.minor)</td></tr>
<tr><th>minor</th>
        <td class="description">Minor version number (major.minor)</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 on success, 0 on failure</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The <code>ipp</code> parameter refers to an IPP message previously created using
the <a href="#ippNew"><code>ippNew</code></a>, <a href="#ippNewRequest"><code>ippNewRequest</code></a>, or  <a href="#ippNewResponse"><code>ippNewResponse</code></a> functions.<br>
<br>
The valid version numbers are currently 1.0, 1.1, 2.0, 2.1, and 2.2.

</p>
<h3 class="function"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span><a id="ippStateString">ippStateString</a></h3>
        <p class="description">Return the name corresponding to a state value.</p>
<p class="code">
const char *ippStateString(<a href="#ipp_state_t">ipp_state_t</a> state);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>state</th>
        <td class="description">State value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">State name</p>
<h3 class="function"><span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span><a id="ippTagString">ippTagString</a></h3>
        <p class="description">Return the tag name corresponding to a tag value.</p>
<p class="code">
const char *ippTagString(ipp_tag_t tag);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>tag</th>
        <td class="description">Tag value</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Tag name</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The returned names are defined in RFC 8011 and the IANA IPP Registry.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span><a id="ippTagValue">ippTagValue</a></h3>
        <p class="description">Return the tag value corresponding to a tag name.</p>
<p class="code">
ipp_tag_t ippTagValue(const char *name);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>name</th>
        <td class="description">Tag name</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Tag value</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">The tag names are defined in RFC 8011 and the IANA IPP Registry.

</p>
<h3 class="function"><a id="ippTimeToDate">ippTimeToDate</a></h3>
        <p class="description">Convert from time in seconds to RFC 2579 format.</p>
<p class="code">
const <a href="#ipp_uchar_t">ipp_uchar_t</a> *ippTimeToDate(time_t t);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>t</th>
        <td class="description">Time in seconds</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">RFC-2579 date/time data</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippValidateAttribute">ippValidateAttribute</a></h3>
        <p class="description">Validate the contents of an attribute.</p>
<p class="code">
int ippValidateAttribute(<a href="#ipp_attribute_t">ipp_attribute_t</a> *attr);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>attr</th>
        <td class="description">Attribute</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if valid, 0 otherwise</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function validates the contents of an attribute based on the name and
value tag.  1 is returned if the attribute is valid, 0 otherwise.  On
failure, <a href="#cupsLastErrorString"><code>cupsLastErrorString</code></a> is set to a human-readable message.

</p>
<h3 class="function"><span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span><a id="ippValidateAttributes">ippValidateAttributes</a></h3>
        <p class="description">Validate all attributes in an IPP message.</p>
<p class="code">
int ippValidateAttributes(<a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>ipp</th>
        <td class="description">IPP message</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">1 if valid, 0 otherwise</p>
<h4 class="discussion">Discussion</h4>
        <p class="discussion">This function validates the contents of the IPP message, including each
attribute.  Like <a href="#ippValidateAttribute"><code>ippValidateAttribute</code></a>, <a href="#cupsLastErrorString"><code>cupsLastErrorString</code></a> is
set to a human-readable message on failure.

</p>
<h3 class="function"><a id="ippWrite">ippWrite</a></h3>
        <p class="description">Write data for an IPP message to a HTTP connection.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippWrite(<a href="#http_t">http_t</a> *http, <a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>http</th>
        <td class="description">HTTP connection</td></tr>
<tr><th>ipp</th>
        <td class="description">IPP data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.1.19/macOS 10.3&#160;</span><a id="ippWriteFile">ippWriteFile</a></h3>
        <p class="description">Write data for an IPP message to a file.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippWriteFile(int fd, <a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>fd</th>
        <td class="description">HTTP data</td></tr>
<tr><th>ipp</th>
        <td class="description">IPP data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current state</p>
<h3 class="function"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span><a id="ippWriteIO">ippWriteIO</a></h3>
        <p class="description">Write data for an IPP message.</p>
<p class="code">
<a href="#ipp_state_t">ipp_state_t</a> ippWriteIO(void *dst, <a href="#ipp_iocb_t">ipp_iocb_t</a> cb, int blocking, <a href="#ipp_t">ipp_t</a> *parent, <a href="#ipp_t">ipp_t</a> *ipp);</p>
<h4 class="parameters">Parameters</h4>
<table class="list"><tbody>
<tr><th>dst</th>
        <td class="description">Destination</td></tr>
<tr><th>cb</th>
        <td class="description">Write callback function</td></tr>
<tr><th>blocking</th>
        <td class="description">Use blocking IO?</td></tr>
<tr><th>parent</th>
        <td class="description">Parent IPP message</td></tr>
<tr><th>ipp</th>
        <td class="description">IPP data</td></tr>
</tbody></table>
<h4 class="returnvalue">Return Value</h4>
        <p class="description">Current state</p>
      <h2 class="title"><a id="TYPES">Data Types</a></h2>
      <h3 class="typedef"><a id="cups_client_cert_cb_t"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span>cups_client_cert_cb_t</a></h3>
        <p class="description">Client credentials callback
</p>
      <p class="code">
typedef int(*)(http_t *http, void *tls, cups_array_t *distinguished_names, void *user_data)cups_client_cert_cb_t;
</p>
      <h3 class="typedef"><a id="cups_dest_cb_t"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span>cups_dest_cb_t</a></h3>
        <p class="description">Destination enumeration callback
</p>
      <p class="code">
typedef int(*)(void *user_data, unsigned flags, <a href="#cups_dest_t">cups_dest_t</a> *dest)cups_dest_cb_t;
</p>
      <h3 class="typedef"><a id="cups_dest_t">cups_dest_t</a></h3>
        <p class="description">Destination</p>
      <p class="code">
typedef struct <a href="#cups_dest_s">cups_dest_s</a> cups_dest_t;
</p>
      <h3 class="typedef"><a id="cups_dinfo_t"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span>cups_dinfo_t</a></h3>
        <p class="description">Destination capability and status
information </p>
      <p class="code">
typedef struct _cups_dinfo_s cups_dinfo_t;
</p>
      <h3 class="typedef"><a id="cups_job_t">cups_job_t</a></h3>
        <p class="description">Job</p>
      <p class="code">
typedef struct <a href="#cups_job_s">cups_job_s</a> cups_job_t;
</p>
      <h3 class="typedef"><a id="cups_option_t">cups_option_t</a></h3>
        <p class="description">Printer Options</p>
      <p class="code">
typedef struct <a href="#cups_option_s">cups_option_s</a> cups_option_t;
</p>
      <h3 class="typedef"><a id="cups_password_cb2_t"><span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span>cups_password_cb2_t</a></h3>
        <p class="description">New password callback
</p>
      <p class="code">
typedef const char *(*)(const char *prompt, <a href="#http_t">http_t</a> *http, const char *method, const char *resource, void *user_data)cups_password_cb2_t;
</p>
      <h3 class="typedef"><a id="cups_ptype_t">cups_ptype_t</a></h3>
        <p class="description">Printer type/capability bits</p>
      <p class="code">
typedef unsigned cups_ptype_t;
</p>
      <h3 class="typedef"><a id="cups_server_cert_cb_t"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span>cups_server_cert_cb_t</a></h3>
        <p class="description">Server credentials callback
</p>
      <p class="code">
typedef int(*)(http_t *http, void *tls, cups_array_t *certs, void *user_data)cups_server_cert_cb_t;
</p>
      <h3 class="typedef"><a id="cups_size_t"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span>cups_size_t</a></h3>
        <p class="description">Media Size </p>
      <p class="code">
typedef struct <a href="#cups_size_s">cups_size_s</a> cups_size_t;
</p>
      <h3 class="typedef"><a id="http_addr_t"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span>http_addr_t</a></h3>
        <p class="description">Socket address union, which
makes using IPv6 and other
address types easier and
more portable. </p>
      <p class="code">
typedef union _http_addr_u / http_addr_t;
</p>
      <h3 class="typedef"><a id="http_encoding_t">http_encoding_t</a></h3>
        <p class="description">HTTP transfer encoding values</p>
      <p class="code">
typedef enum <a href="#http_encoding_e">http_encoding_e</a> http_encoding_t;
</p>
      <h3 class="typedef"><a id="http_encryption_t">http_encryption_t</a></h3>
        <p class="description">HTTP encryption values</p>
      <p class="code">
typedef enum <a href="#http_encryption_e">http_encryption_e</a> http_encryption_t;
</p>
      <h3 class="typedef"><a id="http_field_t">http_field_t</a></h3>
        <p class="description">HTTP field names</p>
      <p class="code">
typedef enum <a href="#http_field_e">http_field_e</a> http_field_t;
</p>
      <h3 class="typedef"><a id="http_keepalive_t">http_keepalive_t</a></h3>
        <p class="description">HTTP keep-alive values</p>
      <p class="code">
typedef enum <a href="#http_keepalive_e">http_keepalive_e</a> http_keepalive_t;
</p>
      <h3 class="typedef"><a id="http_state_t">http_state_t</a></h3>
        <p class="description">HTTP state values; states
are server-oriented...</p>
      <p class="code">
typedef enum <a href="#http_state_e">http_state_e</a> http_state_t;
</p>
      <h3 class="typedef"><a id="http_t">http_t</a></h3>
        <p class="description">HTTP connection type</p>
      <p class="code">
typedef struct _http_s http_t;
</p>
      <h3 class="typedef"><a id="http_timeout_cb_t"><span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span>http_timeout_cb_t</a></h3>
        <p class="description">HTTP timeout callback </p>
      <p class="code">
typedef int(*)(http_t *http, void *user_data)http_timeout_cb_t;
</p>
      <h3 class="typedef"><a id="http_trust_t"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span>http_trust_t</a></h3>
        <p class="description">Level of trust for credentials </p>
      <p class="code">
typedef enum <a href="#http_trust_e">http_trust_e</a> http_trust_t;
</p>
      <h3 class="typedef"><a id="http_uri_coding_t">http_uri_coding_t</a></h3>
        <p class="description">URI en/decode flags</p>
      <p class="code">
typedef enum <a href="#http_uri_coding_e">http_uri_coding_e</a> http_uri_coding_t;
</p>
      <h3 class="typedef"><a id="http_uri_status_t"><span class="info">&#160;CUPS 1.2&#160;</span>http_uri_status_t</a></h3>
        <p class="description">URI separation status </p>
      <p class="code">
typedef enum <a href="#http_uri_status_e">http_uri_status_e</a> http_uri_status_t;
</p>
      <h3 class="typedef"><a id="ipp_attribute_t">ipp_attribute_t</a></h3>
        <p class="description">IPP attribute</p>
      <p class="code">
typedef struct _ipp_attribute_s ipp_attribute_t;
</p>
      <h3 class="typedef"><a id="ipp_copycb_t"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span>ipp_copycb_t</a></h3>
        <p class="description">ippCopyAttributes callback function </p>
      <p class="code">
typedef int(*)(void *context, <a href="#ipp_t">ipp_t</a> *dst, <a href="#ipp_attribute_t">ipp_attribute_t</a> *attr)ipp_copycb_t;
</p>
      <h3 class="typedef"><a id="ipp_iocb_t"><span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span>ipp_iocb_t</a></h3>
        <p class="description">ippReadIO/ippWriteIO callback function </p>
      <p class="code">
typedef ssize_t(*)(void *context, ipp_uchar_t *buffer, size_t bytes) ipp_iocb_t;
</p>
      <h3 class="typedef"><a id="ipp_orient_t">ipp_orient_t</a></h3>
        <p class="description">Orientation values</p>
      <p class="code">
typedef enum <a href="#ipp_orient_e">ipp_orient_e</a> ipp_orient_t;
</p>
      <h3 class="typedef"><a id="ipp_pstate_t">ipp_pstate_t</a></h3>
        <p class="description">Printer state values</p>
      <p class="code">
typedef enum <a href="#ipp_pstate_e">ipp_pstate_e</a> ipp_pstate_t;
</p>
      <h3 class="typedef"><a id="ipp_quality_t">ipp_quality_t</a></h3>
        <p class="description">Print quality values</p>
      <p class="code">
typedef enum <a href="#ipp_quality_e">ipp_quality_e</a> ipp_quality_t;
</p>
      <h3 class="typedef"><a id="ipp_res_t">ipp_res_t</a></h3>
        <p class="description">Resolution units</p>
      <p class="code">
typedef enum <a href="#ipp_res_e">ipp_res_e</a> ipp_res_t;
</p>
      <h3 class="typedef"><a id="ipp_rstate_t">ipp_rstate_t</a></h3>
        <p class="description">resource-state values</p>
      <p class="code">
typedef enum <a href="#ipp_rstate_e">ipp_rstate_e</a> ipp_rstate_t;
</p>
      <h3 class="typedef"><a id="ipp_sstate_t">ipp_sstate_t</a></h3>
        <p class="description">system-state values</p>
      <p class="code">
typedef enum <a href="#ipp_sstate_e">ipp_sstate_e</a> ipp_sstate_t;
</p>
      <h3 class="typedef"><a id="ipp_state_t">ipp_state_t</a></h3>
        <p class="description">ipp_t state values</p>
      <p class="code">
typedef enum <a href="#ipp_state_e">ipp_state_e</a> ipp_state_t;
</p>
      <h3 class="typedef"><a id="ipp_t">ipp_t</a></h3>
        <p class="description">IPP request/response data</p>
      <p class="code">
typedef struct _ipp_s ipp_t;
</p>
      <h2 class="title"><a id="STRUCTURES">Structures</a></h2>
<h3 class="struct"><a id="cups_dest_s">cups_dest_s</a></h3>
        <p class="description">Destination</p>
<p class="code">struct cups_dest_s {<br>
&#160;&#160;&#160;&#160;char *name, *instance;<br>
&#160;&#160;&#160;&#160;int is_default;<br>
&#160;&#160;&#160;&#160;int num_options;<br>
&#160;&#160;&#160;&#160;<a href="#cups_option_t">cups_option_t</a> *options;<br>
};</p>
<h4 class="members">Members</h4>
<table class="list"><tbody>
<tr><th>instance </th>
        <td class="description">Local instance name or NULL</td></tr>
<tr><th>is_default </th>
        <td class="description">Is this printer the default?</td></tr>
<tr><th>num_options </th>
        <td class="description">Number of options</td></tr>
<tr><th>options </th>
        <td class="description">Options</td></tr>
</tbody></table>
<h3 class="struct"><a id="cups_job_s">cups_job_s</a></h3>
        <p class="description">Job</p>
<p class="code">struct cups_job_s {<br>
&#160;&#160;&#160;&#160;time_t completed_time;<br>
&#160;&#160;&#160;&#160;time_t creation_time;<br>
&#160;&#160;&#160;&#160;char *dest;<br>
&#160;&#160;&#160;&#160;char *format;<br>
&#160;&#160;&#160;&#160;int id;<br>
&#160;&#160;&#160;&#160;int priority;<br>
&#160;&#160;&#160;&#160;time_t processing_time;<br>
&#160;&#160;&#160;&#160;int size;<br>
&#160;&#160;&#160;&#160;ipp_jstate_t state;<br>
&#160;&#160;&#160;&#160;char *title;<br>
&#160;&#160;&#160;&#160;char *user;<br>
};</p>
<h4 class="members">Members</h4>
<table class="list"><tbody>
<tr><th>completed_time </th>
        <td class="description">Time the job was completed</td></tr>
<tr><th>creation_time </th>
        <td class="description">Time the job was created</td></tr>
<tr><th>dest </th>
        <td class="description">Printer or class name</td></tr>
<tr><th>format </th>
        <td class="description">Document format</td></tr>
<tr><th>id </th>
        <td class="description">The job ID</td></tr>
<tr><th>priority </th>
        <td class="description">Priority (1-100)</td></tr>
<tr><th>processing_time </th>
        <td class="description">Time the job was processed</td></tr>
<tr><th>size </th>
        <td class="description">Size in kilobytes</td></tr>
<tr><th>state </th>
        <td class="description">Job state</td></tr>
<tr><th>title </th>
        <td class="description">Title/job name</td></tr>
<tr><th>user </th>
        <td class="description">User that submitted the job</td></tr>
</tbody></table>
<h3 class="struct"><a id="cups_option_s">cups_option_s</a></h3>
        <p class="description">Printer Options</p>
<p class="code">struct cups_option_s {<br>
&#160;&#160;&#160;&#160;char *name;<br>
&#160;&#160;&#160;&#160;char *value;<br>
};</p>
<h4 class="members">Members</h4>
<table class="list"><tbody>
<tr><th>name </th>
        <td class="description">Name of option</td></tr>
<tr><th>value </th>
        <td class="description">Value of option</td></tr>
</tbody></table>
<h3 class="struct"><span class="info">&#160;CUPS 1.6/macOS 10.8&#160;</span><a id="cups_size_s">cups_size_s</a></h3>
        <p class="description">Media Size </p>
<p class="code">struct cups_size_s {<br>
&#160;&#160;&#160;&#160;char media[128];<br>
&#160;&#160;&#160;&#160;int width, length, bottom, left, right, top;<br>
};</p>
<h4 class="members">Members</h4>
<table class="list"><tbody>
<tr><th>media[128] </th>
        <td class="description">Media name to use</td></tr>
<tr><th>top </th>
        <td class="description">Top margin in hundredths of
millimeters</td></tr>
</tbody></table>
      <h2 class="title"><a id="ENUMERATIONS">Constants</a></h2>
      <h3 class="enumeration"><a id="cups_ptype_e">cups_ptype_e</a></h3>
        <p class="description">Printer type/capability bit
constants</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>CUPS_PRINTER_AUTHENTICATED <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Printer requires authentication
</td></tr>
        <tr><th>CUPS_PRINTER_BIND </th>        <td class="description">Can bind output</td></tr>
        <tr><th>CUPS_PRINTER_BW </th>        <td class="description">Can do B&amp;W printing</td></tr>
        <tr><th>CUPS_PRINTER_CLASS </th>        <td class="description">Printer class</td></tr>
        <tr><th>CUPS_PRINTER_COLLATE </th>        <td class="description">Can quickly collate copies</td></tr>
        <tr><th>CUPS_PRINTER_COLOR </th>        <td class="description">Can do color printing</td></tr>
        <tr><th>CUPS_PRINTER_COMMANDS <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Printer supports maintenance commands
</td></tr>
        <tr><th>CUPS_PRINTER_COPIES </th>        <td class="description">Can do copies in hardware</td></tr>
        <tr><th>CUPS_PRINTER_COVER </th>        <td class="description">Can cover output</td></tr>
        <tr><th>CUPS_PRINTER_DEFAULT </th>        <td class="description">Default printer on network</td></tr>
        <tr><th>CUPS_PRINTER_DISCOVERED <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Printer was discovered </td></tr>
        <tr><th>CUPS_PRINTER_DUPLEX </th>        <td class="description">Can do two-sided printing</td></tr>
        <tr><th>CUPS_PRINTER_FAX </th>        <td class="description">Fax queue</td></tr>
        <tr><th>CUPS_PRINTER_LARGE </th>        <td class="description">Can print on D/E/A1/A0-size media</td></tr>
        <tr><th>CUPS_PRINTER_LOCAL </th>        <td class="description">Local printer or class</td></tr>
        <tr><th>CUPS_PRINTER_MEDIUM </th>        <td class="description">Can print on Tabloid/B/C/A3/A2-size media</td></tr>
        <tr><th>CUPS_PRINTER_NOT_SHARED <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Printer is not shared
</td></tr>
        <tr><th>CUPS_PRINTER_PUNCH </th>        <td class="description">Can punch output</td></tr>
        <tr><th>CUPS_PRINTER_REJECTING </th>        <td class="description">Printer is rejecting jobs</td></tr>
        <tr><th>CUPS_PRINTER_REMOTE </th>        <td class="description">Remote printer or class</td></tr>
        <tr><th>CUPS_PRINTER_SMALL </th>        <td class="description">Can print on Letter/Legal/A4-size media</td></tr>
        <tr><th>CUPS_PRINTER_SORT </th>        <td class="description">Can sort output</td></tr>
        <tr><th>CUPS_PRINTER_STAPLE </th>        <td class="description">Can staple output</td></tr>
        <tr><th>CUPS_PRINTER_VARIABLE </th>        <td class="description">Can print on rolls and custom-size media</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_encoding_e">http_encoding_e</a></h3>
        <p class="description">HTTP transfer encoding values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_ENCODING_CHUNKED </th>        <td class="description">Data is chunked</td></tr>
        <tr><th>HTTP_ENCODING_FIELDS </th>        <td class="description">Sending HTTP fields</td></tr>
        <tr><th>HTTP_ENCODING_LENGTH </th>        <td class="description">Data is sent with Content-Length</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_encryption_e">http_encryption_e</a></h3>
        <p class="description">HTTP encryption values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_ENCRYPTION_ALWAYS </th>        <td class="description">Always encrypt (SSL)</td></tr>
        <tr><th>HTTP_ENCRYPTION_IF_REQUESTED </th>        <td class="description">Encrypt if requested (TLS upgrade)</td></tr>
        <tr><th>HTTP_ENCRYPTION_NEVER </th>        <td class="description">Never encrypt</td></tr>
        <tr><th>HTTP_ENCRYPTION_REQUIRED </th>        <td class="description">Encryption is required (TLS upgrade)</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_field_e">http_field_e</a></h3>
        <p class="description">HTTP field names</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_FIELD_ACCEPT_ENCODING <span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span></th>        <td class="description">Accepting-Encoding field </td></tr>
        <tr><th>HTTP_FIELD_ACCEPT_LANGUAGE </th>        <td class="description">Accept-Language field</td></tr>
        <tr><th>HTTP_FIELD_ACCEPT_RANGES </th>        <td class="description">Accept-Ranges field</td></tr>
        <tr><th>HTTP_FIELD_ALLOW <span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span></th>        <td class="description">Allow field </td></tr>
        <tr><th>HTTP_FIELD_AUTHENTICATION_INFO <span class="info">&#160;CUPS 2.2.9)&#160;</span></th>        <td class="description">Authentication-Info field (</td></tr>
        <tr><th>HTTP_FIELD_AUTHORIZATION </th>        <td class="description">Authorization field</td></tr>
        <tr><th>HTTP_FIELD_CONNECTION </th>        <td class="description">Connection field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_ENCODING </th>        <td class="description">Content-Encoding field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_LANGUAGE </th>        <td class="description">Content-Language field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_LENGTH </th>        <td class="description">Content-Length field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_LOCATION </th>        <td class="description">Content-Location field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_MD5 </th>        <td class="description">Content-MD5 field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_RANGE </th>        <td class="description">Content-Range field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_TYPE </th>        <td class="description">Content-Type field</td></tr>
        <tr><th>HTTP_FIELD_CONTENT_VERSION </th>        <td class="description">Content-Version field</td></tr>
        <tr><th>HTTP_FIELD_DATE </th>        <td class="description">Date field</td></tr>
        <tr><th>HTTP_FIELD_HOST </th>        <td class="description">Host field</td></tr>
        <tr><th>HTTP_FIELD_IF_MODIFIED_SINCE </th>        <td class="description">If-Modified-Since field</td></tr>
        <tr><th>HTTP_FIELD_IF_UNMODIFIED_SINCE </th>        <td class="description">If-Unmodified-Since field</td></tr>
        <tr><th>HTTP_FIELD_KEEP_ALIVE </th>        <td class="description">Keep-Alive field</td></tr>
        <tr><th>HTTP_FIELD_LAST_MODIFIED </th>        <td class="description">Last-Modified field</td></tr>
        <tr><th>HTTP_FIELD_LINK </th>        <td class="description">Link field</td></tr>
        <tr><th>HTTP_FIELD_LOCATION </th>        <td class="description">Location field</td></tr>
        <tr><th>HTTP_FIELD_MAX </th>        <td class="description">Maximum field index</td></tr>
        <tr><th>HTTP_FIELD_RANGE </th>        <td class="description">Range field</td></tr>
        <tr><th>HTTP_FIELD_REFERER </th>        <td class="description">Referer field</td></tr>
        <tr><th>HTTP_FIELD_RETRY_AFTER </th>        <td class="description">Retry-After field</td></tr>
        <tr><th>HTTP_FIELD_SERVER <span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span></th>        <td class="description">Server field </td></tr>
        <tr><th>HTTP_FIELD_TRANSFER_ENCODING </th>        <td class="description">Transfer-Encoding field</td></tr>
        <tr><th>HTTP_FIELD_UNKNOWN </th>        <td class="description">Unknown field</td></tr>
        <tr><th>HTTP_FIELD_UPGRADE </th>        <td class="description">Upgrade field</td></tr>
        <tr><th>HTTP_FIELD_USER_AGENT </th>        <td class="description">User-Agent field</td></tr>
        <tr><th>HTTP_FIELD_WWW_AUTHENTICATE </th>        <td class="description">WWW-Authenticate field</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_keepalive_e">http_keepalive_e</a></h3>
        <p class="description">HTTP keep-alive values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_KEEPALIVE_OFF </th>        <td class="description">No keep alive support</td></tr>
        <tr><th>HTTP_KEEPALIVE_ON </th>        <td class="description">Use keep alive</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_state_e">http_state_e</a></h3>
        <p class="description">HTTP state values; states
are server-oriented...</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_STATE_CONNECT </th>        <td class="description">CONNECT command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_DELETE </th>        <td class="description">DELETE command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_ERROR </th>        <td class="description">Error on socket</td></tr>
        <tr><th>HTTP_STATE_GET </th>        <td class="description">GET command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_GET_SEND </th>        <td class="description">GET command, sending data</td></tr>
        <tr><th>HTTP_STATE_HEAD </th>        <td class="description">HEAD command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_OPTIONS </th>        <td class="description">OPTIONS command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_POST </th>        <td class="description">POST command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_POST_RECV </th>        <td class="description">POST command, receiving data</td></tr>
        <tr><th>HTTP_STATE_POST_SEND </th>        <td class="description">POST command, sending data</td></tr>
        <tr><th>HTTP_STATE_PUT </th>        <td class="description">PUT command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_PUT_RECV </th>        <td class="description">PUT command, receiving data</td></tr>
        <tr><th>HTTP_STATE_STATUS </th>        <td class="description">Command complete, sending status</td></tr>
        <tr><th>HTTP_STATE_TRACE </th>        <td class="description">TRACE command, waiting for blank line</td></tr>
        <tr><th>HTTP_STATE_UNKNOWN_METHOD <span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span></th>        <td class="description">Unknown request method, waiting for blank line </td></tr>
        <tr><th>HTTP_STATE_UNKNOWN_VERSION <span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span></th>        <td class="description">Unknown request method, waiting for blank line </td></tr>
        <tr><th>HTTP_STATE_WAITING </th>        <td class="description">Waiting for command</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_status_e">http_status_e</a></h3>
        <p class="description">HTTP status codes</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_STATUS_ACCEPTED </th>        <td class="description">DELETE command was successful</td></tr>
        <tr><th>HTTP_STATUS_BAD_GATEWAY </th>        <td class="description">Bad gateway</td></tr>
        <tr><th>HTTP_STATUS_BAD_REQUEST </th>        <td class="description">Bad request</td></tr>
        <tr><th>HTTP_STATUS_CONFLICT </th>        <td class="description">Request is self-conflicting</td></tr>
        <tr><th>HTTP_STATUS_CONTINUE </th>        <td class="description">Everything OK, keep going...</td></tr>
        <tr><th>HTTP_STATUS_CREATED </th>        <td class="description">PUT command was successful</td></tr>
        <tr><th>HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED <span class="info">&#160;CUPS 1.4&#160;</span></th>        <td class="description">User canceled authorization </td></tr>
        <tr><th>HTTP_STATUS_CUPS_PKI_ERROR <span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span></th>        <td class="description">Error negotiating a secure connection </td></tr>
        <tr><th>HTTP_STATUS_ERROR </th>        <td class="description">An error response from httpXxxx()</td></tr>
        <tr><th>HTTP_STATUS_EXPECTATION_FAILED </th>        <td class="description">The expectation given in an Expect header field was not met</td></tr>
        <tr><th>HTTP_STATUS_FORBIDDEN </th>        <td class="description">Forbidden to access this URI</td></tr>
        <tr><th>HTTP_STATUS_FOUND </th>        <td class="description">Document was found at a different URI</td></tr>
        <tr><th>HTTP_STATUS_GATEWAY_TIMEOUT </th>        <td class="description">Gateway connection timed out</td></tr>
        <tr><th>HTTP_STATUS_GONE </th>        <td class="description">Server has gone away</td></tr>
        <tr><th>HTTP_STATUS_LENGTH_REQUIRED </th>        <td class="description">A content length or encoding is required</td></tr>
        <tr><th>HTTP_STATUS_METHOD_NOT_ALLOWED </th>        <td class="description">Method is not allowed</td></tr>
        <tr><th>HTTP_STATUS_MOVED_PERMANENTLY </th>        <td class="description">Document has moved permanently</td></tr>
        <tr><th>HTTP_STATUS_MULTIPLE_CHOICES </th>        <td class="description">Multiple files match request</td></tr>
        <tr><th>HTTP_STATUS_NONE <span class="info">&#160;CUPS 1.7/macOS 10.9&#160;</span></th>        <td class="description">No Expect value </td></tr>
        <tr><th>HTTP_STATUS_NOT_ACCEPTABLE </th>        <td class="description">Not Acceptable</td></tr>
        <tr><th>HTTP_STATUS_NOT_AUTHORITATIVE </th>        <td class="description">Information isn't authoritative</td></tr>
        <tr><th>HTTP_STATUS_NOT_FOUND </th>        <td class="description">URI was not found</td></tr>
        <tr><th>HTTP_STATUS_NOT_IMPLEMENTED </th>        <td class="description">Feature not implemented</td></tr>
        <tr><th>HTTP_STATUS_NOT_MODIFIED </th>        <td class="description">File not modified</td></tr>
        <tr><th>HTTP_STATUS_NOT_SUPPORTED </th>        <td class="description">HTTP version not supported</td></tr>
        <tr><th>HTTP_STATUS_NO_CONTENT </th>        <td class="description">Successful command, no new data</td></tr>
        <tr><th>HTTP_STATUS_OK </th>        <td class="description">OPTIONS/GET/HEAD/POST/TRACE command was successful</td></tr>
        <tr><th>HTTP_STATUS_PARTIAL_CONTENT </th>        <td class="description">Only a partial file was received/sent</td></tr>
        <tr><th>HTTP_STATUS_PAYMENT_REQUIRED </th>        <td class="description">Payment required</td></tr>
        <tr><th>HTTP_STATUS_PRECONDITION </th>        <td class="description">Precondition failed</td></tr>
        <tr><th>HTTP_STATUS_PROXY_AUTHENTICATION </th>        <td class="description">Proxy Authentication is Required</td></tr>
        <tr><th>HTTP_STATUS_REQUESTED_RANGE </th>        <td class="description">The requested range is not satisfiable</td></tr>
        <tr><th>HTTP_STATUS_REQUEST_TIMEOUT </th>        <td class="description">Request timed out</td></tr>
        <tr><th>HTTP_STATUS_REQUEST_TOO_LARGE </th>        <td class="description">Request entity too large</td></tr>
        <tr><th>HTTP_STATUS_RESET_CONTENT </th>        <td class="description">Content was reset/recreated</td></tr>
        <tr><th>HTTP_STATUS_SEE_OTHER </th>        <td class="description">See this other link</td></tr>
        <tr><th>HTTP_STATUS_SERVER_ERROR </th>        <td class="description">Internal server error</td></tr>
        <tr><th>HTTP_STATUS_SERVICE_UNAVAILABLE </th>        <td class="description">Service is unavailable</td></tr>
        <tr><th>HTTP_STATUS_SWITCHING_PROTOCOLS </th>        <td class="description">HTTP upgrade to TLS/SSL</td></tr>
        <tr><th>HTTP_STATUS_TEMPORARY_REDIRECT </th>        <td class="description">Temporary redirection</td></tr>
        <tr><th>HTTP_STATUS_UNAUTHORIZED </th>        <td class="description">Unauthorized to access host</td></tr>
        <tr><th>HTTP_STATUS_UNSUPPORTED_MEDIATYPE </th>        <td class="description">The requested media type is unsupported</td></tr>
        <tr><th>HTTP_STATUS_UPGRADE_REQUIRED </th>        <td class="description">Upgrade to SSL/TLS required</td></tr>
        <tr><th>HTTP_STATUS_URI_TOO_LONG </th>        <td class="description">URI too long</td></tr>
        <tr><th>HTTP_STATUS_USE_PROXY </th>        <td class="description">Must use a proxy to access this URI</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_trust_e"><span class="info">&#160;CUPS 2.0/OS 10.10&#160;</span>http_trust_e</a></h3>
        <p class="description">Level of trust for credentials </p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_TRUST_CHANGED </th>        <td class="description">Credentials have changed</td></tr>
        <tr><th>HTTP_TRUST_EXPIRED </th>        <td class="description">Credentials are expired</td></tr>
        <tr><th>HTTP_TRUST_INVALID </th>        <td class="description">Credentials are invalid</td></tr>
        <tr><th>HTTP_TRUST_OK </th>        <td class="description">Credentials are OK/trusted</td></tr>
        <tr><th>HTTP_TRUST_RENEWED </th>        <td class="description">Credentials have been renewed</td></tr>
        <tr><th>HTTP_TRUST_UNKNOWN </th>        <td class="description">Credentials are unknown/new</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_uri_coding_e">http_uri_coding_e</a></h3>
        <p class="description">URI en/decode flags</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_URI_CODING_ALL </th>        <td class="description">En/decode everything</td></tr>
        <tr><th>HTTP_URI_CODING_HOSTNAME </th>        <td class="description">En/decode the hostname portion</td></tr>
        <tr><th>HTTP_URI_CODING_MOST </th>        <td class="description">En/decode all but the query</td></tr>
        <tr><th>HTTP_URI_CODING_NONE </th>        <td class="description">Don't en/decode anything</td></tr>
        <tr><th>HTTP_URI_CODING_QUERY </th>        <td class="description">En/decode the query portion</td></tr>
        <tr><th>HTTP_URI_CODING_RESOURCE </th>        <td class="description">En/decode the resource portion</td></tr>
        <tr><th>HTTP_URI_CODING_RFC6874 </th>        <td class="description">Use RFC 6874 address format</td></tr>
        <tr><th>HTTP_URI_CODING_USERNAME </th>        <td class="description">En/decode the username portion</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="http_uri_status_e"><span class="info">&#160;CUPS 1.2&#160;</span>http_uri_status_e</a></h3>
        <p class="description">URI separation status </p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>HTTP_URI_STATUS_BAD_ARGUMENTS </th>        <td class="description">Bad arguments to function (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_BAD_HOSTNAME </th>        <td class="description">Bad hostname in URI (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_BAD_PORT </th>        <td class="description">Bad port number in URI (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_BAD_RESOURCE </th>        <td class="description">Bad resource in URI (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_BAD_SCHEME </th>        <td class="description">Bad scheme in URI (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_BAD_URI </th>        <td class="description">Bad/empty URI (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_BAD_USERNAME </th>        <td class="description">Bad username in URI (error)</td></tr>
        <tr><th>HTTP_URI_STATUS_MISSING_RESOURCE </th>        <td class="description">Missing resource in URI (warning)</td></tr>
        <tr><th>HTTP_URI_STATUS_MISSING_SCHEME </th>        <td class="description">Missing scheme in URI (warning)</td></tr>
        <tr><th>HTTP_URI_STATUS_OK </th>        <td class="description">URI decoded OK</td></tr>
        <tr><th>HTTP_URI_STATUS_OVERFLOW </th>        <td class="description">URI buffer for httpAssembleURI is too small</td></tr>
        <tr><th>HTTP_URI_STATUS_UNKNOWN_SCHEME </th>        <td class="description">Unknown scheme in URI (warning)</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_finishings_e">ipp_finishings_e</a></h3>
        <p class="description">Finishings values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_FINISHINGS_BALE </th>        <td class="description">Bale (any type)</td></tr>
        <tr><th>IPP_FINISHINGS_BIND </th>        <td class="description">Bind</td></tr>
        <tr><th>IPP_FINISHINGS_BIND_BOTTOM </th>        <td class="description">Bind on bottom</td></tr>
        <tr><th>IPP_FINISHINGS_BIND_LEFT </th>        <td class="description">Bind on left</td></tr>
        <tr><th>IPP_FINISHINGS_BIND_RIGHT </th>        <td class="description">Bind on right</td></tr>
        <tr><th>IPP_FINISHINGS_BIND_TOP </th>        <td class="description">Bind on top</td></tr>
        <tr><th>IPP_FINISHINGS_BOOKLET_MAKER </th>        <td class="description">Fold to make booklet</td></tr>
        <tr><th>IPP_FINISHINGS_COAT </th>        <td class="description">Apply protective liquid or powder coating</td></tr>
        <tr><th>IPP_FINISHINGS_COVER </th>        <td class="description">Add cover</td></tr>
        <tr><th>IPP_FINISHINGS_EDGE_STITCH </th>        <td class="description">Stitch along any side</td></tr>
        <tr><th>IPP_FINISHINGS_EDGE_STITCH_BOTTOM </th>        <td class="description">Stitch along bottom edge</td></tr>
        <tr><th>IPP_FINISHINGS_EDGE_STITCH_LEFT </th>        <td class="description">Stitch along left side</td></tr>
        <tr><th>IPP_FINISHINGS_EDGE_STITCH_RIGHT </th>        <td class="description">Stitch along right side</td></tr>
        <tr><th>IPP_FINISHINGS_EDGE_STITCH_TOP </th>        <td class="description">Stitch along top edge</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD </th>        <td class="description">Fold (any type)</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_ACCORDION </th>        <td class="description">Accordion-fold the paper vertically into four sections</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_DOUBLE_GATE </th>        <td class="description">Fold the top and bottom quarters of the paper towards the midline, then fold in half vertically</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_ENGINEERING_Z </th>        <td class="description">Fold the paper vertically into two small sections and one larger, forming an elongated Z</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_GATE </th>        <td class="description">Fold the top and bottom quarters of the paper towards the midline</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_HALF </th>        <td class="description">Fold the paper in half vertically</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_HALF_Z </th>        <td class="description">Fold the paper in half horizontally, then Z-fold the paper vertically</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_LEFT_GATE </th>        <td class="description">Fold the top quarter of the paper towards the midline</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_LETTER </th>        <td class="description">Fold the paper into three sections vertically; sometimes also known as a C fold</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_PARALLEL </th>        <td class="description">Fold the paper in half vertically two times, yielding four sections</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_POSTER </th>        <td class="description">Fold the paper in half horizontally and vertically; sometimes also called a cross fold</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_RIGHT_GATE </th>        <td class="description">Fold the bottom quarter of the paper towards the midline</td></tr>
        <tr><th>IPP_FINISHINGS_FOLD_Z </th>        <td class="description">Fold the paper vertically into three sections, forming a Z</td></tr>
        <tr><th>IPP_FINISHINGS_JOG_OFFSET </th>        <td class="description">Offset for binding (any type)</td></tr>
        <tr><th>IPP_FINISHINGS_LAMINATE </th>        <td class="description">Apply protective (solid) material</td></tr>
        <tr><th>IPP_FINISHINGS_NONE </th>        <td class="description">No finishing</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH </th>        <td class="description">Punch (any location/count)</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_BOTTOM_LEFT </th>        <td class="description">Punch 1 hole bottom left</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_BOTTOM_RIGHT </th>        <td class="description">Punch 1 hole bottom right</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_DUAL_BOTTOM </th>        <td class="description">Punch 2 holes bottom edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_DUAL_LEFT </th>        <td class="description">Punch 2 holes left side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_DUAL_RIGHT </th>        <td class="description">Punch 2 holes right side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_DUAL_TOP </th>        <td class="description">Punch 2 holes top edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_MULTIPLE_BOTTOM </th>        <td class="description">Punch multiple holes bottom edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_MULTIPLE_LEFT </th>        <td class="description">Punch multiple holes left side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_MULTIPLE_RIGHT </th>        <td class="description">Punch multiple holes right side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_MULTIPLE_TOP </th>        <td class="description">Punch multiple holes top edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_QUAD_BOTTOM </th>        <td class="description">Punch 4 holes bottom edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_QUAD_LEFT </th>        <td class="description">Punch 4 holes left side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_QUAD_RIGHT </th>        <td class="description">Punch 4 holes right side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_QUAD_TOP </th>        <td class="description">Punch 4 holes top edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_TOP_LEFT </th>        <td class="description">Punch 1 hole top left</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_TOP_RIGHT </th>        <td class="description">Punch 1 hole top right</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_TRIPLE_BOTTOM </th>        <td class="description">Punch 3 holes bottom edge</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_TRIPLE_LEFT </th>        <td class="description">Punch 3 holes left side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_TRIPLE_RIGHT </th>        <td class="description">Punch 3 holes right side</td></tr>
        <tr><th>IPP_FINISHINGS_PUNCH_TRIPLE_TOP </th>        <td class="description">Punch 3 holes top edge</td></tr>
        <tr><th>IPP_FINISHINGS_SADDLE_STITCH </th>        <td class="description">Staple interior</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE </th>        <td class="description">Staple (any location/method)</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_BOTTOM_LEFT </th>        <td class="description">Staple bottom left corner</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_BOTTOM_RIGHT </th>        <td class="description">Staple bottom right corner</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_DUAL_BOTTOM </th>        <td class="description">Two staples on bottom</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_DUAL_LEFT </th>        <td class="description">Two staples on left</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_DUAL_RIGHT </th>        <td class="description">Two staples on right</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_DUAL_TOP </th>        <td class="description">Two staples on top</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_TOP_LEFT </th>        <td class="description">Staple top left corner</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_TOP_RIGHT </th>        <td class="description">Staple top right corner</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_TRIPLE_BOTTOM </th>        <td class="description">Three staples on bottom</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_TRIPLE_LEFT </th>        <td class="description">Three staples on left</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_TRIPLE_RIGHT </th>        <td class="description">Three staples on right</td></tr>
        <tr><th>IPP_FINISHINGS_STAPLE_TRIPLE_TOP </th>        <td class="description">Three staples on top</td></tr>
        <tr><th>IPP_FINISHINGS_TRIM </th>        <td class="description">Trim (any type)</td></tr>
        <tr><th>IPP_FINISHINGS_TRIM_AFTER_COPIES </th>        <td class="description">Trim output after each copy</td></tr>
        <tr><th>IPP_FINISHINGS_TRIM_AFTER_DOCUMENTS </th>        <td class="description">Trim output after each document</td></tr>
        <tr><th>IPP_FINISHINGS_TRIM_AFTER_JOB </th>        <td class="description">Trim output after job</td></tr>
        <tr><th>IPP_FINISHINGS_TRIM_AFTER_PAGES </th>        <td class="description">Trim output after each page</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_jstate_e">ipp_jstate_e</a></h3>
        <p class="description">Job states</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_JSTATE_ABORTED </th>        <td class="description">Job has aborted due to error</td></tr>
        <tr><th>IPP_JSTATE_CANCELED </th>        <td class="description">Job has been canceled</td></tr>
        <tr><th>IPP_JSTATE_COMPLETED </th>        <td class="description">Job has completed successfully</td></tr>
        <tr><th>IPP_JSTATE_HELD </th>        <td class="description">Job is held for printing</td></tr>
        <tr><th>IPP_JSTATE_PENDING </th>        <td class="description">Job is waiting to be printed</td></tr>
        <tr><th>IPP_JSTATE_PROCESSING </th>        <td class="description">Job is currently printing</td></tr>
        <tr><th>IPP_JSTATE_STOPPED </th>        <td class="description">Job has been stopped</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_op_e">ipp_op_e</a></h3>
        <p class="description">IPP operations</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_OP_ALLOCATE_PRINTER_RESOURCES </th>        <td class="description">Allocate-Printer-Resources: Use resources for a printer.</td></tr>
        <tr><th>IPP_OP_CANCEL_CURRENT_JOB </th>        <td class="description">Cancel-Current-Job: Cancel the current job</td></tr>
        <tr><th>IPP_OP_CANCEL_JOB </th>        <td class="description">Cancel-Job: Cancel a job</td></tr>
        <tr><th>IPP_OP_CANCEL_JOBS </th>        <td class="description">Cancel-Jobs: Cancel all jobs (administrative)</td></tr>
        <tr><th>IPP_OP_CANCEL_MY_JOBS </th>        <td class="description">Cancel-My-Jobs: Cancel a user's jobs</td></tr>
        <tr><th>IPP_OP_CANCEL_RESOURCE </th>        <td class="description">Cancel-Resource: Uninstall a resource.</td></tr>
        <tr><th>IPP_OP_CANCEL_SUBSCRIPTION <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Cancel-Subscription: Cancel a subscription </td></tr>
        <tr><th>IPP_OP_CLOSE_JOB </th>        <td class="description">Close-Job: Close a job and start printing</td></tr>
        <tr><th>IPP_OP_CREATE_JOB </th>        <td class="description">Create-Job: Create an empty print job</td></tr>
        <tr><th>IPP_OP_CREATE_JOB_SUBSCRIPTIONS <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Create-Job-Subscriptions: Create one of more job subscriptions </td></tr>
        <tr><th>IPP_OP_CREATE_PRINTER </th>        <td class="description">Create-Printer: Create a new service.</td></tr>
        <tr><th>IPP_OP_CREATE_PRINTER_SUBSCRIPTIONS <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Create-Printer-Subscriptions: Create one or more printer subscriptions </td></tr>
        <tr><th>IPP_OP_CREATE_RESOURCE </th>        <td class="description">Create-Resource: Create a new (empty) resource.</td></tr>
        <tr><th>IPP_OP_CREATE_RESOURCE_SUBSCRIPTIONS </th>        <td class="description">Create-Resource-Subscriptions: Create event subscriptions for a resource.</td></tr>
        <tr><th>IPP_OP_CREATE_SYSTEM_SUBSCRIPTIONS </th>        <td class="description">Create-System-Subscriptions: Create event subscriptions for a system.</td></tr>
        <tr><th>IPP_OP_CUPS_ADD_MODIFY_CLASS </th>        <td class="description">CUPS-Add-Modify-Class: Add or modify a class</td></tr>
        <tr><th>IPP_OP_CUPS_ADD_MODIFY_PRINTER </th>        <td class="description">CUPS-Add-Modify-Printer: Add or modify a printer</td></tr>
        <tr><th>IPP_OP_CUPS_AUTHENTICATE_JOB <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">CUPS-Authenticate-Job: Authenticate a job </td></tr>
        <tr><th>IPP_OP_CUPS_CREATE_LOCAL_PRINTER <span class="info">&#160;CUPS 2.2&#160;</span></th>        <td class="description">CUPS-Create-Local-Printer: Create a local (temporary) printer </td></tr>
        <tr><th>IPP_OP_CUPS_DELETE_CLASS </th>        <td class="description">CUPS-Delete-Class: Delete a class</td></tr>
        <tr><th>IPP_OP_CUPS_DELETE_PRINTER </th>        <td class="description">CUPS-Delete-Printer: Delete a printer</td></tr>
        <tr><th>IPP_OP_CUPS_GET_DEFAULT </th>        <td class="description">CUPS-Get-Default: Get the default printer</td></tr>
        <tr><th>IPP_OP_CUPS_GET_DEVICES <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">CUPS-Get-Devices: Get a list of supported devices </td></tr>
        <tr><th>IPP_OP_CUPS_GET_DOCUMENT <span class="info">&#160;CUPS 1.4/macOS 10.6&#160;</span></th>        <td class="description">CUPS-Get-Document: Get a document file </td></tr>
        <tr><th>IPP_OP_CUPS_GET_PPD <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">CUPS-Get-PPD: Get a PPD file </td></tr>
        <tr><th>IPP_OP_CUPS_GET_PPDS <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">CUPS-Get-PPDs: Get a list of supported drivers </td></tr>
        <tr><th>IPP_OP_CUPS_GET_PRINTERS </th>        <td class="description">CUPS-Get-Printers: Get a list of printers and/or classes</td></tr>
        <tr><th>IPP_OP_CUPS_INVALID </th>        <td class="description">Invalid operation name for <a href="#ippOpValue"><code>ippOpValue</code></a></td></tr>
        <tr><th>IPP_OP_CUPS_MOVE_JOB </th>        <td class="description">CUPS-Move-Job: Move a job to a different printer</td></tr>
        <tr><th>IPP_OP_CUPS_SET_DEFAULT </th>        <td class="description">CUPS-Set-Default: Set the default printer</td></tr>
        <tr><th>IPP_OP_DEALLOCATE_PRINTER_RESOURCES </th>        <td class="description">Deallocate-Printer-Resources: Stop using resources for a printer.</td></tr>
        <tr><th>IPP_OP_DELETE_PRINTER </th>        <td class="description">Delete-Printer: Delete an existing service.</td></tr>
        <tr><th>IPP_OP_DISABLE_ALL_PRINTERS </th>        <td class="description">Disable-All-Printers: Stop accepting new jobs on all services.</td></tr>
        <tr><th>IPP_OP_DISABLE_PRINTER </th>        <td class="description">Disable-Printer: Reject new jobs for a printer</td></tr>
        <tr><th>IPP_OP_ENABLE_ALL_PRINTERS </th>        <td class="description">Enable-All-Printers: Start accepting new jobs on all services.</td></tr>
        <tr><th>IPP_OP_ENABLE_PRINTER </th>        <td class="description">Enable-Printer: Accept new jobs for a printer</td></tr>
        <tr><th>IPP_OP_GET_JOBS </th>        <td class="description">Get-Jobs: Get a list of jobs</td></tr>
        <tr><th>IPP_OP_GET_JOB_ATTRIBUTES </th>        <td class="description">Get-Job-Attribute: Get information about a job</td></tr>
        <tr><th>IPP_OP_GET_NOTIFICATIONS <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Get-Notifications: Get notification events </td></tr>
        <tr><th>IPP_OP_GET_PRINTERS </th>        <td class="description">Get-Printers: Get a list of services.</td></tr>
        <tr><th>IPP_OP_GET_PRINTER_ATTRIBUTES </th>        <td class="description">Get-Printer-Attributes: Get information about a printer</td></tr>
        <tr><th>IPP_OP_GET_PRINTER_SUPPORTED_VALUES </th>        <td class="description">Get-Printer-Supported-Values: Get supported values</td></tr>
        <tr><th>IPP_OP_GET_SUBSCRIPTIONS <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Get-Subscriptions: Get list of subscriptions </td></tr>
        <tr><th>IPP_OP_GET_SUBSCRIPTION_ATTRIBUTES <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Get-Subscription-Attributes: Get subscription information </td></tr>
        <tr><th>IPP_OP_GET_SYSTEM_ATTRIBUTES </th>        <td class="description">Get-System-Attributes: Get system object attributes.</td></tr>
        <tr><th>IPP_OP_GET_SYSTEM_SUPPORTED_VALUES </th>        <td class="description">Get-System-Supported-Values: Get supported values for system object attributes.</td></tr>
        <tr><th>IPP_OP_HOLD_JOB </th>        <td class="description">Hold-Job: Hold a job for printing</td></tr>
        <tr><th>IPP_OP_HOLD_NEW_JOBS </th>        <td class="description">Hold-New-Jobs: Hold new jobs</td></tr>
        <tr><th>IPP_OP_IDENTIFY_PRINTER </th>        <td class="description">Identify-Printer: Make the printer beep, flash, or display a message for identification</td></tr>
        <tr><th>IPP_OP_INSTALL_RESOURCE </th>        <td class="description">Install-Resource: Install a resource.</td></tr>
        <tr><th>IPP_OP_PAUSE_ALL_PRINTERS </th>        <td class="description">Pause-All-Printers: Stop all services immediately.</td></tr>
        <tr><th>IPP_OP_PAUSE_ALL_PRINTERS_AFTER_CURRENT_JOB </th>        <td class="description">Pause-All-Printers-After-Current-Job: Stop all services after processing the current jobs.</td></tr>
        <tr><th>IPP_OP_PAUSE_PRINTER </th>        <td class="description">Pause-Printer: Stop a printer</td></tr>
        <tr><th>IPP_OP_PAUSE_PRINTER_AFTER_CURRENT_JOB </th>        <td class="description">Pause-Printer-After-Current-Job: Stop printer after the current job</td></tr>
        <tr><th>IPP_OP_PRINT_JOB </th>        <td class="description">Print-Job: Print a single file</td></tr>
        <tr><th>IPP_OP_PROMOTE_JOB </th>        <td class="description">Promote-Job: Promote a job to print sooner</td></tr>
        <tr><th>IPP_OP_REGISTER_OUTPUT_DEVICE </th>        <td class="description">Register-Output-Device: Register a remote service.</td></tr>
        <tr><th>IPP_OP_RELEASE_HELD_NEW_JOBS </th>        <td class="description">Release-Held-New-Jobs: Release new jobs that were previously held</td></tr>
        <tr><th>IPP_OP_RELEASE_JOB </th>        <td class="description">Release-Job: Release a job for printing</td></tr>
        <tr><th>IPP_OP_RENEW_SUBSCRIPTION <span class="info">&#160;CUPS 1.2/macOS 10.5&#160;</span></th>        <td class="description">Renew-Subscription: Renew a printer subscription </td></tr>
        <tr><th>IPP_OP_RESTART_JOB <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">Restart-Job: Reprint a job </td></tr>
        <tr><th>IPP_OP_RESTART_SYSTEM </th>        <td class="description">Restart-System: Restart all services.</td></tr>
        <tr><th>IPP_OP_RESUME_ALL_PRINTERS </th>        <td class="description">Resume-All-Printers: Start job processing on all services.</td></tr>
        <tr><th>IPP_OP_RESUME_JOB </th>        <td class="description">Resume-Job: Resume the current job</td></tr>
        <tr><th>IPP_OP_RESUME_PRINTER </th>        <td class="description">Resume-Printer: Start a printer</td></tr>
        <tr><th>IPP_OP_SCHEDULE_JOB_AFTER </th>        <td class="description">Schedule-Job-After: Schedule a job to print after another</td></tr>
        <tr><th>IPP_OP_SEND_DOCUMENT </th>        <td class="description">Send-Document: Add a file to a job</td></tr>
        <tr><th>IPP_OP_SEND_RESOURCE_DATA </th>        <td class="description">Send-Resource-Data: Upload the data for a resource.</td></tr>
        <tr><th>IPP_OP_SET_JOB_ATTRIBUTES </th>        <td class="description">Set-Job-Attributes: Set job values</td></tr>
        <tr><th>IPP_OP_SET_PRINTER_ATTRIBUTES </th>        <td class="description">Set-Printer-Attributes: Set printer values</td></tr>
        <tr><th>IPP_OP_SET_RESOURCE_ATTRIBUTES </th>        <td class="description">Set-Resource-Attributes: Set resource object  attributes.</td></tr>
        <tr><th>IPP_OP_SET_SYSTEM_ATTRIBUTES </th>        <td class="description">Set-System-Attributes: Set system object attributes.</td></tr>
        <tr><th>IPP_OP_SHUTDOWN_ALL_PRINTERS </th>        <td class="description">Shutdown-All-Printers: Shutdown all services.</td></tr>
        <tr><th>IPP_OP_SHUTDOWN_ONE_PRINTER </th>        <td class="description">Shutdown-One-Printer: Shutdown a service.</td></tr>
        <tr><th>IPP_OP_STARTUP_ALL_PRINTERS </th>        <td class="description">Startup-All-Printers: Startup all services.</td></tr>
        <tr><th>IPP_OP_STARTUP_ONE_PRINTER </th>        <td class="description">Startup-One-Printer: Start a service.</td></tr>
        <tr><th>IPP_OP_SUSPEND_CURRENT_JOB </th>        <td class="description">Suspend-Current-Job: Suspend the current job</td></tr>
        <tr><th>IPP_OP_VALIDATE_JOB </th>        <td class="description">Validate-Job: Validate job values prior to submission</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_orient_e">ipp_orient_e</a></h3>
        <p class="description">Orientation values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_ORIENT_LANDSCAPE </th>        <td class="description">90 degrees counter-clockwise</td></tr>
        <tr><th>IPP_ORIENT_NONE </th>        <td class="description">No rotation</td></tr>
        <tr><th>IPP_ORIENT_PORTRAIT </th>        <td class="description">No rotation</td></tr>
        <tr><th>IPP_ORIENT_REVERSE_LANDSCAPE </th>        <td class="description">90 degrees clockwise</td></tr>
        <tr><th>IPP_ORIENT_REVERSE_PORTRAIT </th>        <td class="description">180 degrees</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_pstate_e">ipp_pstate_e</a></h3>
        <p class="description">Printer state values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_PSTATE_IDLE </th>        <td class="description">Printer is idle</td></tr>
        <tr><th>IPP_PSTATE_PROCESSING </th>        <td class="description">Printer is working</td></tr>
        <tr><th>IPP_PSTATE_STOPPED </th>        <td class="description">Printer is stopped</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_quality_e">ipp_quality_e</a></h3>
        <p class="description">Print quality values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_QUALITY_DRAFT </th>        <td class="description">Draft quality</td></tr>
        <tr><th>IPP_QUALITY_HIGH </th>        <td class="description">High quality</td></tr>
        <tr><th>IPP_QUALITY_NORMAL </th>        <td class="description">Normal quality</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_res_e">ipp_res_e</a></h3>
        <p class="description">Resolution units</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_RES_PER_CM </th>        <td class="description">Pixels per centimeter</td></tr>
        <tr><th>IPP_RES_PER_INCH </th>        <td class="description">Pixels per inch</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_rstate_e">ipp_rstate_e</a></h3>
        <p class="description">resource-state values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_RSTATE_ABORTED </th>        <td class="description">Resource has been aborted and is pending deletion.</td></tr>
        <tr><th>IPP_RSTATE_AVAILABLE </th>        <td class="description">Resource is available for installation.</td></tr>
        <tr><th>IPP_RSTATE_CANCELED </th>        <td class="description">Resource has been canceled and is pending deletion.</td></tr>
        <tr><th>IPP_RSTATE_INSTALLED </th>        <td class="description">Resource is installed.</td></tr>
        <tr><th>IPP_RSTATE_PENDING </th>        <td class="description">Resource is created but has no data yet.</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_sstate_e">ipp_sstate_e</a></h3>
        <p class="description">system-state values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_SSTATE_IDLE </th>        <td class="description">At least one printer is idle and none are processing a job.</td></tr>
        <tr><th>IPP_SSTATE_PROCESSING </th>        <td class="description">At least one printer is processing a job.</td></tr>
        <tr><th>IPP_SSTATE_STOPPED </th>        <td class="description">All printers are stopped.</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_state_e">ipp_state_e</a></h3>
        <p class="description">ipp_t state values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_STATE_ATTRIBUTE </th>        <td class="description">One or more attributes need to be sent/received</td></tr>
        <tr><th>IPP_STATE_DATA </th>        <td class="description">IPP request data needs to be sent/received</td></tr>
        <tr><th>IPP_STATE_ERROR </th>        <td class="description">An error occurred</td></tr>
        <tr><th>IPP_STATE_HEADER </th>        <td class="description">The request header needs to be sent/received</td></tr>
        <tr><th>IPP_STATE_IDLE </th>        <td class="description">Nothing is happening/request completed</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_status_e">ipp_status_e</a></h3>
        <p class="description">IPP status code values</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_STATUS_CUPS_INVALID </th>        <td class="description">Invalid status name for <a href="#ippErrorValue"><code>ippErrorValue</code></a></td></tr>
        <tr><th>IPP_STATUS_ERROR_ACCOUNT_AUTHORIZATION_FAILED </th>        <td class="description">client-error-account-authorization-failed</td></tr>
        <tr><th>IPP_STATUS_ERROR_ACCOUNT_CLOSED </th>        <td class="description">client-error-account-closed</td></tr>
        <tr><th>IPP_STATUS_ERROR_ACCOUNT_INFO_NEEDED </th>        <td class="description">client-error-account-info-needed</td></tr>
        <tr><th>IPP_STATUS_ERROR_ACCOUNT_LIMIT_REACHED </th>        <td class="description">client-error-account-limit-reached</td></tr>
        <tr><th>IPP_STATUS_ERROR_ATTRIBUTES_NOT_SETTABLE </th>        <td class="description">client-error-attributes-not-settable</td></tr>
        <tr><th>IPP_STATUS_ERROR_ATTRIBUTES_OR_VALUES </th>        <td class="description">client-error-attributes-or-values-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_BAD_REQUEST </th>        <td class="description">client-error-bad-request</td></tr>
        <tr><th>IPP_STATUS_ERROR_BUSY </th>        <td class="description">server-error-busy</td></tr>
        <tr><th>IPP_STATUS_ERROR_CHARSET </th>        <td class="description">client-error-charset-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_COMPRESSION_ERROR </th>        <td class="description">client-error-compression-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_COMPRESSION_NOT_SUPPORTED </th>        <td class="description">client-error-compression-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_CONFLICTING </th>        <td class="description">client-error-conflicting-attributes</td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_ACCOUNT_AUTHORIZATION_FAILED <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">cups-error-account-authorization-failed </td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_ACCOUNT_CLOSED </th>        <td class="description">cups-error-account-closed @deprecate@</td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_ACCOUNT_INFO_NEEDED <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">cups-error-account-info-needed </td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_ACCOUNT_LIMIT_REACHED <span class="info">&#160;DEPRECATED&#160;</span></th>        <td class="description">cups-error-account-limit-reached </td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_AUTHENTICATION_CANCELED <span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span></th>        <td class="description">cups-authentication-canceled - Authentication canceled by user </td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_PKI <span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span></th>        <td class="description">cups-pki-error - Error negotiating a secure connection </td></tr>
        <tr><th>IPP_STATUS_ERROR_CUPS_UPGRADE_REQUIRED <span class="info">&#160;CUPS 1.5/macOS 10.7&#160;</span></th>        <td class="description">cups-upgrade-required - TLS upgrade required </td></tr>
        <tr><th>IPP_STATUS_ERROR_DEVICE </th>        <td class="description">server-error-device-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_ACCESS </th>        <td class="description">client-error-document-access-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_FORMAT_ERROR </th>        <td class="description">client-error-document-format-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_FORMAT_NOT_SUPPORTED </th>        <td class="description">client-error-document-format-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_PASSWORD </th>        <td class="description">client-error-document-password-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_PERMISSION </th>        <td class="description">client-error-document-permission-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_SECURITY </th>        <td class="description">client-error-document-security-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_DOCUMENT_UNPRINTABLE </th>        <td class="description">client-error-document-unprintable-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_FORBIDDEN </th>        <td class="description">client-error-forbidden</td></tr>
        <tr><th>IPP_STATUS_ERROR_GONE </th>        <td class="description">client-error-gone</td></tr>
        <tr><th>IPP_STATUS_ERROR_IGNORED_ALL_SUBSCRIPTIONS </th>        <td class="description">client-error-ignored-all-subscriptions</td></tr>
        <tr><th>IPP_STATUS_ERROR_INTERNAL </th>        <td class="description">server-error-internal-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_JOB_CANCELED </th>        <td class="description">server-error-job-canceled</td></tr>
        <tr><th>IPP_STATUS_ERROR_MULTIPLE_JOBS_NOT_SUPPORTED </th>        <td class="description">server-error-multiple-document-jobs-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_NOT_ACCEPTING_JOBS </th>        <td class="description">server-error-not-accepting-jobs</td></tr>
        <tr><th>IPP_STATUS_ERROR_NOT_AUTHENTICATED </th>        <td class="description">client-error-not-authenticated</td></tr>
        <tr><th>IPP_STATUS_ERROR_NOT_AUTHORIZED </th>        <td class="description">client-error-not-authorized</td></tr>
        <tr><th>IPP_STATUS_ERROR_NOT_FETCHABLE </th>        <td class="description">client-error-not-fetchable</td></tr>
        <tr><th>IPP_STATUS_ERROR_NOT_FOUND </th>        <td class="description">client-error-not-found</td></tr>
        <tr><th>IPP_STATUS_ERROR_NOT_POSSIBLE </th>        <td class="description">client-error-not-possible</td></tr>
        <tr><th>IPP_STATUS_ERROR_OPERATION_NOT_SUPPORTED </th>        <td class="description">server-error-operation-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_PRINTER_IS_DEACTIVATED </th>        <td class="description">server-error-printer-is-deactivated</td></tr>
        <tr><th>IPP_STATUS_ERROR_REQUEST_ENTITY </th>        <td class="description">client-error-request-entity-too-large</td></tr>
        <tr><th>IPP_STATUS_ERROR_REQUEST_VALUE </th>        <td class="description">client-error-request-value-too-long</td></tr>
        <tr><th>IPP_STATUS_ERROR_SERVICE_UNAVAILABLE </th>        <td class="description">server-error-service-unavailable</td></tr>
        <tr><th>IPP_STATUS_ERROR_TEMPORARY </th>        <td class="description">server-error-temporary-error</td></tr>
        <tr><th>IPP_STATUS_ERROR_TIMEOUT </th>        <td class="description">client-error-timeout</td></tr>
        <tr><th>IPP_STATUS_ERROR_TOO_MANY_DOCUMENTS </th>        <td class="description">server-error-too-many-documents</td></tr>
        <tr><th>IPP_STATUS_ERROR_TOO_MANY_JOBS </th>        <td class="description">server-error-too-many-jobs</td></tr>
        <tr><th>IPP_STATUS_ERROR_TOO_MANY_SUBSCRIPTIONS </th>        <td class="description">client-error-too-many-subscriptions</td></tr>
        <tr><th>IPP_STATUS_ERROR_URI_SCHEME </th>        <td class="description">client-error-uri-scheme-not-supported</td></tr>
        <tr><th>IPP_STATUS_ERROR_VERSION_NOT_SUPPORTED </th>        <td class="description">server-error-version-not-supported</td></tr>
        <tr><th>IPP_STATUS_OK </th>        <td class="description">successful-ok</td></tr>
        <tr><th>IPP_STATUS_OK_CONFLICTING </th>        <td class="description">successful-ok-conflicting-attributes</td></tr>
        <tr><th>IPP_STATUS_OK_EVENTS_COMPLETE </th>        <td class="description">successful-ok-events-complete</td></tr>
        <tr><th>IPP_STATUS_OK_IGNORED_OR_SUBSTITUTED </th>        <td class="description">successful-ok-ignored-or-substituted-attributes</td></tr>
        <tr><th>IPP_STATUS_OK_IGNORED_SUBSCRIPTIONS </th>        <td class="description">successful-ok-ignored-subscriptions</td></tr>
        <tr><th>IPP_STATUS_OK_TOO_MANY_EVENTS </th>        <td class="description">successful-ok-too-many-events</td></tr>
</tbody></table>
      <h3 class="enumeration"><a id="ipp_tag_e">ipp_tag_e</a></h3>
        <p class="description">Value and group tag values for attributes</p>
      <h4 class="constants">Constants</h4>
      <table class="list"><tbody>
        <tr><th>IPP_TAG_ADMINDEFINE </th>        <td class="description">Admin-defined value</td></tr>
        <tr><th>IPP_TAG_BOOLEAN </th>        <td class="description">Boolean value</td></tr>
        <tr><th>IPP_TAG_CHARSET </th>        <td class="description">Character set value</td></tr>
        <tr><th>IPP_TAG_CUPS_INVALID </th>        <td class="description">Invalid tag name for <a href="#ippTagValue"><code>ippTagValue</code></a></td></tr>
        <tr><th>IPP_TAG_DATE </th>        <td class="description">Date/time value</td></tr>
        <tr><th>IPP_TAG_DEFAULT </th>        <td class="description">Default value</td></tr>
        <tr><th>IPP_TAG_DELETEATTR </th>        <td class="description">Delete-attribute value</td></tr>
        <tr><th>IPP_TAG_DOCUMENT </th>        <td class="description">Document group</td></tr>
        <tr><th>IPP_TAG_END </th>        <td class="description">End-of-attributes</td></tr>
        <tr><th>IPP_TAG_ENUM </th>        <td class="description">Enumeration value</td></tr>
        <tr><th>IPP_TAG_EVENT_NOTIFICATION </th>        <td class="description">Event group</td></tr>
        <tr><th>IPP_TAG_INTEGER </th>        <td class="description">Integer value</td></tr>
        <tr><th>IPP_TAG_JOB </th>        <td class="description">Job group</td></tr>
        <tr><th>IPP_TAG_KEYWORD </th>        <td class="description">Keyword value</td></tr>
        <tr><th>IPP_TAG_LANGUAGE </th>        <td class="description">Language value</td></tr>
        <tr><th>IPP_TAG_MIMETYPE </th>        <td class="description">MIME media type value</td></tr>
        <tr><th>IPP_TAG_NAME </th>        <td class="description">Name value</td></tr>
        <tr><th>IPP_TAG_NAMELANG </th>        <td class="description">Name-with-language value</td></tr>
        <tr><th>IPP_TAG_NOTSETTABLE </th>        <td class="description">Not-settable value</td></tr>
        <tr><th>IPP_TAG_NOVALUE </th>        <td class="description">No-value value</td></tr>
        <tr><th>IPP_TAG_OPERATION </th>        <td class="description">Operation group</td></tr>
        <tr><th>IPP_TAG_PRINTER </th>        <td class="description">Printer group</td></tr>
        <tr><th>IPP_TAG_RANGE </th>        <td class="description">Range value</td></tr>
        <tr><th>IPP_TAG_RESOLUTION </th>        <td class="description">Resolution value</td></tr>
        <tr><th>IPP_TAG_RESOURCE </th>        <td class="description">Resource group</td></tr>
        <tr><th>IPP_TAG_STRING </th>        <td class="description">Octet string value</td></tr>
        <tr><th>IPP_TAG_SUBSCRIPTION </th>        <td class="description">Subscription group</td></tr>
        <tr><th>IPP_TAG_SYSTEM </th>        <td class="description">System group</td></tr>
        <tr><th>IPP_TAG_TEXT </th>        <td class="description">Text value</td></tr>
        <tr><th>IPP_TAG_TEXTLANG </th>        <td class="description">Text-with-language value</td></tr>
        <tr><th>IPP_TAG_UNKNOWN </th>        <td class="description">Unknown value</td></tr>
        <tr><th>IPP_TAG_UNSUPPORTED_GROUP </th>        <td class="description">Unsupported attributes group</td></tr>
        <tr><th>IPP_TAG_UNSUPPORTED_VALUE </th>        <td class="description">Unsupported value</td></tr>
        <tr><th>IPP_TAG_URI </th>        <td class="description">URI value</td></tr>
        <tr><th>IPP_TAG_URISCHEME </th>        <td class="description">URI scheme value</td></tr>
        <tr><th>IPP_TAG_ZERO </th>        <td class="description">Zero tag - used for separators</td></tr>
</tbody></table>
    </div>
  </body>
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